{"title":"Master Alloys","description":"","products":[{"product_id":"18k-pink-solder-master-alloys-easy-medium-hard","title":"Pink Solder Alloys-For Making 18K Pink Solder-Easy, Medium \u0026 Hard","description":"\u003cp\u003eThese solder alloys are formulated to allow jewelers to make their own 18K pink solder in-house. \u003cstrong\u003eThese alloys contain no gold.\u003c\/strong\u003e To achieve 18K gold, simply combine 75% fine gold with 25% alloy by weight. Available in Easy, Medium, and Hard tempers to suit a range of soldering applications. Sold by the troy ounce (20 DWT).\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eEnables in-house production of 18K pink solder\u003c\/li\u003e\n\u003cli\u003eContains no gold — add your own fine gold to karat correctly\u003c\/li\u003e\n\u003cli\u003eSimple ratio: 75% fine gold + 25% alloy for 18K gold\u003c\/li\u003e\n\u003cli\u003eAvailable in three flow temperatures: Easy, Medium, and Hard\u003c\/li\u003e\n\u003cli\u003eSold by the troy ounce (20 DWT)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eKarat Target\u003c\/th\u003e\n\u003ctd\u003e18K Pink Gold\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGold Content\u003c\/th\u003e\n\u003ctd\u003eNone — alloy only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMixing Ratio\u003c\/th\u003e\n\u003ctd\u003e75% fine gold + 25% alloy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold By\u003c\/th\u003e\n\u003ctd\u003eTroy ounce (20 DWT)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eAvailable Options\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003ePart #\u003c\/th\u003e\n\u003cth\u003eType\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e846-13SA\u003c\/td\u003e\n\u003ctd\u003e18K Pink Hard\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e846-14SA\u003c\/td\u003e\n\u003ctd\u003e18K Pink Medium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e846-15SA\u003c\/td\u003e\n\u003ctd\u003e18K Pink Easy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e","brand":"Otto Frei","offers":[{"title":"18K Pink Hard","offer_id":47561549512918,"sku":"846-13SA","price":21.4,"currency_code":"USD","in_stock":true},{"title":"18K Pink Medium","offer_id":47557337481430,"sku":"846-14SA","price":22.7,"currency_code":"USD","in_stock":true},{"title":"18K Pink Easy","offer_id":43557692899542,"sku":"846-15SA","price":24.2,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/pink-solder-alloys-for-making-18k-pink-solder-easy-medium-and-hard-otto-frei.jpg?v=1719958951"},{"product_id":"white-9-18k-investment-casting-master-alloy-nickel-based-per-troy-ounce","title":"White 9-18 Investment Casting Master Alloy-Per Troy Ounce (20DWT)","description":"\u003cp\u003eThis nickel-based white master alloy — previously called \u003cem\u003eWhite Century\u003c\/em\u003e — is formulated for investment casting and fabrication of 9K–18K white gold. Specially engineered for peak performance in enclosed or automated casting equipment, it contains copper, nickel, and zinc, plus a small amount of silicon as a deoxidizer. Additional proprietary metals are present in the formulation that are not listed in the published composition. Sold by the troy ounce (20 pennyweight \/ 31.1 grams).\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eNickel-based alloy suitable for 9K–18K white gold casting and fabrication\u003c\/li\u003e\n\u003cli\u003eProduces a white finished color\u003c\/li\u003e\n\u003cli\u003eOptimized for enclosed and automated casting equipment\u003c\/li\u003e\n\u003cli\u003eContains silicon as a deoxidizer for cleaner melts\u003c\/li\u003e\n\u003cli\u003ePreviously marketed as White Century alloy\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eAlloy Base\u003c\/th\u003e\n\u003ctd\u003eNickel-based\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition – Copper (Cu)\u003c\/th\u003e\n\u003ctd\u003e57.7%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition – Zinc (Zn)\u003c\/th\u003e\n\u003ctd\u003e18.1%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition – Nickel (Ni)\u003c\/th\u003e\n\u003ctd\u003e24.2%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAdditional Components\u003c\/th\u003e\n\u003ctd\u003eSilicon (deoxidizer); proprietary metals not disclosed in composition\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKarat Range\u003c\/th\u003e\n\u003ctd\u003e9K – 18K white gold\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold By\u003c\/th\u003e\n\u003ctd\u003eTroy ounce (20 DWT \/ 31.1 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePart Number\u003c\/th\u003e\n\u003ctd\u003e846-100\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eUsage Instructions\u003c\/h3\u003e\n\u003cp\u003ePre-alloy all alloy and fine gold together with aggressive stirring and fluxing to ensure a uniform mixture before casting.\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eStep 1 – Pre-Alloying Temperature (fine gold + alloy):\u003c\/strong\u003e 1050°C – 1060°C \/ 1922°F – 1940°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStep 2 – Casting Temperature for 9K–10K alloyed grain:\u003c\/strong\u003e 1030°C – 1040°C \/ 1886°F – 1904°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStep 3 – Casting Temperature for 14K–18K alloyed grain:\u003c\/strong\u003e 1000°C – 1020°C \/ 1832°F – 1868°F\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cstrong\u003eFlask Temperature:\u003c\/strong\u003e 580°C – 700°C \/ 1076°F – 1292°F, depending on flask size, karat, and jewelry type.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFluxing:\u003c\/strong\u003e Fluxing white gold is critical for collecting oxides. Boric acid is the recommended flux. Do not use carbon fluxes or refining fluxes such as soda ash or saltpeter. Avoid flux in bottom-pour automatic casting units.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQuench Time:\u003c\/strong\u003e 10–15 minutes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInvestment Removal:\u003c\/strong\u003e Most standard investment removers will successfully remove investment powder. Aggressive acids cause stress corrosion and surface damage and are not recommended.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eScrap Reuse:\u003c\/strong\u003e A 70% fresh–30% scrap mix is recommended. White gold alloy has approximately one-third the reusability of yellow gold alloys.\u003c\/p\u003e\n\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMelt temperature may vary depending on casting unit type.\u003c\/li\u003e\n\u003cli\u003eProprietary metals are present in the formulation and are not included in the published composition percentages.\u003c\/li\u003e\n\u003cli\u003eThis product contains nickel. See California Proposition 65 warnings as applicable.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Otto Frei","offers":[{"title":"Default Title","offer_id":43581633790166,"sku":"846-100","price":7.74,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/white-9-18-investment-casting-master-alloy-per-troy-ounce-20dwt-otto-frei.jpg?v=1719957479"},{"product_id":"ultra-white-10-18k-nickel-based-fabrication-casting-master-alloy-per-troy-ounce","title":"Ultra White For Making 10-18 White Multi-Purpose Alloy-Per Troy Ounce (20 DWT)","description":"\u003cp\u003eThis ultra white fabrication alloy is nickel-based and contains no gold and no silver. Designed as a multi-purpose master alloy for both casting and fabrication applications, it is suitable for making white gold alloys from 10K through 18K. Sold by the troy ounce (20 DWT).\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eNote: There are proprietary metals in the formulation that are not included in the composition listing below.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eNickel-based multi-purpose alloy for casting and fabrication\u003c\/li\u003e\n\u003cli\u003eCompatible with white gold alloys from 10K to 18K\u003c\/li\u003e\n\u003cli\u003eContains no gold and no silver\u003c\/li\u003e\n\u003cli\u003ePre-alloying with aggressive stirring and fluxing recommended for a uniform mixture\u003c\/li\u003e\n\u003cli\u003eBoric acid is the recommended flux — do not use carbon fluxes or refining fluxes such as soda ash or saltpeter\u003c\/li\u003e\n\u003cli\u003eAvoid flux in bottom-pour automatic casting units\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition – Copper (Cu)\u003c\/th\u003e\n\u003ctd\u003e63%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition – Zinc (Zn)\u003c\/th\u003e\n\u003ctd\u003e17%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition – Nickel (Ni)\u003c\/th\u003e\n\u003ctd\u003e19.5%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition – Silver (Ag)\u003c\/th\u003e\n\u003ctd\u003e0%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eContains Gold\u003c\/th\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBase Metal\u003c\/th\u003e\n\u003ctd\u003eNickel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKarat Range\u003c\/th\u003e\n\u003ctd\u003e10K – 18K\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eCasting and fabrication\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold By\u003c\/th\u003e\n\u003ctd\u003eTroy ounce (20 DWT)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eUsage Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003ePre-Alloying (Fine gold + alloy):\u003c\/strong\u003e Heat to 1090°C – 1100°C \/ 1994°F – 2030°F with aggressive stirring and fluxing to ensure a uniform mixture.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCasting Temperature for 10K Alloyed Grain:\u003c\/strong\u003e 1085°C – 1105°C \/ 1985°F – 2021°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCasting Temperature for 14K Alloyed Grain:\u003c\/strong\u003e 1025°C – 1045°C \/ 1877°F – 1913°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCasting Temperature for 18K Alloyed Grain:\u003c\/strong\u003e 995°C – 1015°C \/ 1832°F – 1859°F\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMelt temperature may vary\u003c\/strong\u003e depending on the type of casting unit used.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlask Temperature:\u003c\/strong\u003e Recommended range is 540°C – 675°C \/ 1004°F – 1247°F, depending on flask size, karat, and jewelry type.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuench Time:\u003c\/strong\u003e 25 minutes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInvestment Removal:\u003c\/strong\u003e Most standard investment removers will successfully remove investment powder. Aggressive acids are not recommended, as they cause stress corrosion and surface damage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eScrap Reuse:\u003c\/strong\u003e A 70% fresh – 30% scrap mix is recommended. White gold alloy has approximately one-third the reusability of yellow gold alloys.\u003c\/li\u003e\n\u003cli\u003eThis product contains nickel. See applicable Proposition 65 warnings.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Otto Frei","offers":[{"title":"Default Title","offer_id":43581634052310,"sku":"846-103","price":8.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/ultra-white-for-making-10-18-white-multi-purpose-alloy-per-troy-ounce-20-dwt-otto-frei.jpg?v=1719957479"},{"product_id":"dark-yellow-casting-master-alloy-9k-14k","title":"Dark Yellow 9-14 Investment Casting Master Alloy For Stone In Place Casting-Per Troy Ounce (20 DWT)","description":"\u003cp\u003eThis \u003cstrong\u003eDark Yellow Investment Casting Master Alloy\u003c\/strong\u003e is formulated for alloying with pure gold to produce 9K to 14K casting alloy, with specific performance characteristics suited for \u003cstrong\u003estone-in-place casting\u003c\/strong\u003e. Sold per troy ounce (20 pennyweights \/ 31.1 grams), this master alloy contains no gold — it is designed to be combined with fine gold to achieve the desired karat and color.\u003c\/p\u003e\u003cp\u003eThe dark yellow color profile makes it well suited for warm-toned gold alloys in the 9K to 14K range. Note that the formulation may include proprietary metals, silicon, and deoxidizers beyond the listed composition.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eEngineered for \u003cstrong\u003estone-in-place investment casting\u003c\/strong\u003e applications\u003c\/li\u003e\n\u003cli\u003eProduces \u003cstrong\u003edark yellow\u003c\/strong\u003e gold alloys when combined with pure gold\u003c\/li\u003e\n\u003cli\u003eCompatible with gold alloy targets from \u003cstrong\u003e9K to 14K\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContains no gold\u003c\/strong\u003e — sold as a master alloy for blending with fine gold\u003c\/li\u003e\n\u003cli\u003eMay contain proprietary metals, silicon, and deoxidizers for optimized casting performance\u003c\/li\u003e\n\u003cli\u003eSold by the troy ounce (20 DWT \/ 31.1 grams)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eColor\u003c\/th\u003e\n\u003ctd\u003eDark Yellow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eInvestment casting master alloy; stone-in-place casting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGold Content\u003c\/th\u003e\n\u003ctd\u003eNone — alloy base only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Karat Range\u003c\/th\u003e\n\u003ctd\u003e9K–14K\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition (listed)\u003c\/th\u003e\n\u003ctd\u003eCopper (Cu) 73.7%, Silver (Ag) 14.8%, Zinc (Zn) 11.5%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAdditional Components\u003c\/th\u003e\n\u003ctd\u003eMay contain proprietary metals, silicon, and deoxidizers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold By\u003c\/th\u003e\n\u003ctd\u003eTroy ounce (20 DWT \/ 31.1 grams)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eNotes\u003c\/h3\u003e\u003cp\u003eComposition percentages reflect listed ingredients only. Proprietary metals and processing additives such as silicon and deoxidizers may also be present in the formulation but are not disclosed in the composition breakdown. Always verify final alloy karat and properties through testing before use in finished work.\u003c\/p\u003e","brand":"Otto Frei","offers":[{"title":"Default Title","offer_id":43581634183382,"sku":"846-128","price":26.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/dark-yellow-9-14-investment-casting-master-alloy-for-stone-in-place-casting-per-troy-ounce-20-dwt-otto-frei.jpg?v=1719957479"},{"product_id":"yellow-casting-master-alloy-10-14k","title":"Standard Yellow 9-14 Investment Casting Master Alloy-Per Troy Ounce (20DWT)","description":"\u003cp\u003eA reliable, professional-grade investment casting master alloy formulated to produce a darker yellow tone ideal for 10K–14K gold alloying. This alloy contains no gold and is sold per troy ounce (20 pennyweights \/ 31.1 grams), making it a cost-effective base for custom casting work. With a higher copper content and reduced silver compared to similar casting alloys, it delivers a warmer, deeper yellow color well-suited to yellow gold casting applications.\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eHigher copper, lower silver ratio produces a distinctively darker yellow tone\u003c\/li\u003e\n\u003cli\u003eFormulated specifically for investment casting applications\u003c\/li\u003e\n\u003cli\u003eCompatible with 10K–14K yellow gold alloying\u003c\/li\u003e\n\u003cli\u003eContains no gold — sold as a master alloy base\u003c\/li\u003e\n\u003cli\u003eSold per troy ounce (20 DWT \/ 31.1 grams)\u003c\/li\u003e\n\u003cli\u003eProprietary formulation may also include silicon and de-oxidizing elements\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eInvestment casting master alloy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGold Content\u003c\/th\u003e\n\u003ctd\u003eNone — master alloy base only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCopper (Cu)\u003c\/th\u003e\n\u003ctd\u003e73.7%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSilver (Ag)\u003c\/th\u003e\n\u003ctd\u003e14.8%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eZinc (Zn)\u003c\/th\u003e\n\u003ctd\u003e11.5%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAdditional Elements\u003c\/th\u003e\n\u003ctd\u003eProprietary; may include silicon and de-oxidizing agents\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold By\u003c\/th\u003e\n\u003ctd\u003eTroy ounce (20 pennyweights \/ 31.1 grams)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKarat Range\u003c\/th\u003e\n\u003ctd\u003e10K–14K yellow gold\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cp\u003eThe full composition includes proprietary metals not disclosed in the listed percentages. The alloy may also contain additional elements such as silicon and de-oxidizing agents. Composition figures reflect primary constituents only.\u003c\/p\u003e","brand":"Otto Frei","offers":[{"title":"Default Title","offer_id":43581634511062,"sku":"846-132","price":26.75,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/standard-yellow-9-14-investment-casting-master-alloy-per-troy-ounce-20dwt-otto-frei.jpg?v=1719957479"},{"product_id":"light-yellow-9-14k-investment-casting-master-alloy-per-troy-ounce","title":"Light Yellow 9-14 Investment Casting Master Alloy-Per Troy Ounce (20DWT)","description":"\u003cp\u003eA popular all-around investment casting master alloy formulated for producing 9–14k gold. This alloy contains more silver than comparable formulations, resulting in a lighter, greener yellow tone. When used for 14k gold, it yields a medium light yellow color. Sold by the troy ounce (20 pennyweights or 31.1 grams).\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eVersatile master alloy suitable for 9–14k investment casting applications\u003c\/li\u003e\n\u003cli\u003eHigher silver content delivers a lighter, greener yellow compared to lower-silver alternatives\u003c\/li\u003e\n\u003cli\u003eProduces a medium light yellow color when alloyed to 14k\u003c\/li\u003e\n\u003cli\u003eSold by the troy ounce (20 DWT \/ 31.1 grams)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition – Copper (Cu)\u003c\/th\u003e\n\u003ctd\u003e68.7%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition – Silver (Ag)\u003c\/th\u003e\n\u003ctd\u003e17.3%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition – Zinc (Zn)\u003c\/th\u003e\n\u003ctd\u003e14%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSuitable Karat Range\u003c\/th\u003e\n\u003ctd\u003e9–14k\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eColor Result (14k)\u003c\/th\u003e\n\u003ctd\u003eMedium light yellow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold By\u003c\/th\u003e\n\u003ctd\u003eTroy ounce (20 DWT \/ 31.1 grams)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eNotes\u003c\/h3\u003e\u003cp\u003eThis alloy contains proprietary metals not listed in the composition section. The formulation may also include additional elements such as silicon and deoxidizers.\u003c\/p\u003e","brand":"Otto Frei","offers":[{"title":"Default Title","offer_id":43581634969814,"sku":"846-134","price":30.75,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/light-yellow-9-14-investment-casting-master-alloy-per-troy-ounce-20dwt-otto-frei.jpg?v=1719957479"},{"product_id":"ultra-white-9-18-investment-casting-master-alloy","title":"Ultra White 9-18 Investment Casting Master Alloy","description":"\u003cp\u003eThe Ultra White 9–18 Investment Casting Master Alloy is a nickel-based white gold master alloy formulated for investment casting and fabrication applications across 10K, 14K, and 18K gold. Sold by the troy ounce (20 pennyweights \/ 31.1 grams), this alloy contains no gold and is designed to be pre-alloyed with fine gold before casting. Note that proprietary metals are present in the formulation in addition to the listed composition, and the alloy may also contain silicon and deoxidizers.\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCompatible with 10K, 14K, and 18K white gold casting applications\u003c\/li\u003e\n\u003cli\u003eSuitable for both investment casting and fabrication\u003c\/li\u003e\n\u003cli\u003eContains no gold — pre-alloy with fine gold prior to casting\u003c\/li\u003e\n\u003cli\u003eMay also contain silicon and deoxidizers in addition to listed composition\u003c\/li\u003e\n\u003cli\u003eSold by the troy ounce (20 pennyweights \/ 31.1 grams)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition (listed)\u003c\/th\u003e\n\u003ctd\u003eCu 57%, Zn 21%, Ni 22%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGold Content\u003c\/th\u003e\n\u003ctd\u003eContains no gold\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAdditional Ingredients\u003c\/th\u003e\n\u003ctd\u003eProprietary metals; may also contain silicon and deoxidizers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold By\u003c\/th\u003e\n\u003ctd\u003eTroy ounce (20 pennyweights \/ 31.1 grams)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003ePre-Alloying:\u003c\/strong\u003e Pre-alloying all alloy and fine gold with aggressive stirring and fluxing is recommended to ensure a uniform mixture.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStep 1 — Pre-Alloying Temperatures:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e10K: 1060°C – 1080°C \/ 1940°F – 1976°F\u003c\/li\u003e\n\u003cli\u003e14K–18K: 1050°C – 1060°C \/ 1922°F – 1940°F\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eStep 2 — Casting Temperatures:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e10K Alloyed Grain: 1055°C – 1075°C \/ 1931°F – 1967°F\u003c\/li\u003e\n\u003cli\u003e14K Alloyed Grain: 1015°C – 1035°C \/ 1859°F – 1895°F\u003c\/li\u003e\n\u003cli\u003e18K Alloyed Grain: 990°C – 1010°C \/ 1814°F – 1850°F\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eMelt temperature may vary with type of unit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFlask Temperature:\u003c\/strong\u003e Normal recommended range is 540°C – 675°C \/ 1004°F – 1247°F, depending on flask size, karat, and jewelry type.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFluxing:\u003c\/strong\u003e Fluxing white gold is extremely important for collecting oxides. Boric acid is the recommended flux. Do not use carbon fluxes or refining fluxes such as soda ash or saltpeter. Avoid flux in bottom-pour automatic casting units.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQuench Time:\u003c\/strong\u003e 10–12 minutes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInvestment Removal:\u003c\/strong\u003e Most standard investment removers will successfully remove investment powder. Use of aggressive acids is not recommended, as it causes stress corrosion and surface damage.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eScrap Mix:\u003c\/strong\u003e A 70% fresh–30% scrap mix is recommended. White gold alloy has approximately one-third the reusability of yellow gold alloys.\u003c\/p\u003e","brand":"Otto Frei","offers":[{"title":"Default Title","offer_id":43581635199190,"sku":"846-140","price":9.35,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/ultra-white-9-18-investment-casting-master-alloy-otto-frei.jpg?v=1719957478"},{"product_id":"ultra-white-nickel-master-alloy-14k-18k-white-gold-fabrication-per-troy-ounce","title":"Ultra White 14-18 Fabrication Master Alloy Per Troy Ounce","description":"\u003cp\u003eUltra White is a nickel-based fabrication master alloy designed for making 14K and 18K white gold alloys. It offers high tensile strength and contains no silver or gold. Sold by the troy ounce (20 pennyweights \/ 31.1 grams), this alloy is also suitable for casting applications. Note: proprietary metals are present in the formulation that are not reflected in the published composition; the alloy may also contain silicon and deoxidizers.\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eNickel-based master alloy for 14K–18K white gold fabrication\u003c\/li\u003e\n\u003cli\u003eHigh tensile strength\u003c\/li\u003e\n\u003cli\u003eContains no silver and no gold\u003c\/li\u003e\n\u003cli\u003eSuitable for both fabrication and casting\u003c\/li\u003e\n\u003cli\u003eSold by the troy ounce (20 DWT \/ 31.1 g)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eAlloy Base\u003c\/th\u003e\n\u003ctd\u003eNickel-based\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition (Cu)\u003c\/th\u003e\n\u003ctd\u003e59.9%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition (Zn)\u003c\/th\u003e\n\u003ctd\u003e20%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition (Ni)\u003c\/th\u003e\n\u003ctd\u003e20%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAdditional Constituents\u003c\/th\u003e\n\u003ctd\u003eProprietary metals; may also contain silicon and deoxidizers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRecommended Karat Range\u003c\/th\u003e\n\u003ctd\u003e14K–18K white gold\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInitial Melting Temperature\u003c\/th\u003e\n\u003ctd\u003e1070°C \/ 1958°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePouring Temp – 14K Ingots\u003c\/th\u003e\n\u003ctd\u003e1010°C \/ 1850°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePouring Temp – 18K Ingots\u003c\/th\u003e\n\u003ctd\u003e1015°C \/ 1860°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAnnealing Temperature\u003c\/th\u003e\n\u003ctd\u003e732°C \/ 1350°F for 20 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold By\u003c\/th\u003e\n\u003ctd\u003eTroy ounce (20 DWT \/ 31.1 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eMelting:\u003c\/strong\u003e Melt the alloy and fine gold together in a clean crucible — place the alloy on the bottom and fine gold on top. Use boric acid flux to keep metal clean. Stir thoroughly before pouring. A neutral or reducing cover gas is strongly recommended for white gold alloys.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePouring:\u003c\/strong\u003e Pour into a preheated vertical graphite mold or a lightly lubricated iron mold using a steady, even motion. Slow the pour at the end to minimize shrinkage at the top of the ingot. Use a round rod mold for wire; use an L-shaped 2-piece mold for plate and sheet.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo Not Quench:\u003c\/strong\u003e Remove the ingot from the mold and allow it to air cool. Nickel white gold alloys will be significantly softer if allowed to air cool after pouring and after each anneal. Soak in hot pickle solution to remove surface oxides.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFabrication:\u003c\/strong\u003e Clean the ingot of all oxide and flux before rolling. Reduce the ingot by 50% before each anneal — too small a reduction can cause cracking during anneal. Clean in hot pickle after each anneal. Keep rolls, dies, and metal clean to prevent surface defects.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAnnealing:\u003c\/strong\u003e Anneal at 732°C \/ 1350°F for 20 minutes. Do not quench — allow to air cool. Apply a boric acid fire coat before annealing in an open-atmosphere oven to limit oxidation. Avoid over-annealing, which can cause excessive grain growth, orange-peel surface texture, or reduced strength.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRemelting:\u003c\/strong\u003e Use a 30% scrap to 70% fresh mix. Nickel white gold alloys have approximately one-third the reusability of yellow gold alloys.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAdditional Guidelines:\u003c\/strong\u003e Use very little boric acid flux. Do not use carbon-based flux (e.g., soda ash, saltpeter). No flux is required in a bottom-pour automatic casting unit. Avoid aggressive acids, which can cause corrosion and surface damage. To calculate required metal weight in grams, multiply density (g\/cc) by wax weight (g) and add 10% for the button. Gypsum-bonded investment is recommended — follow the manufacturer's burnout cycle instructions.\u003c\/p\u003e","brand":"Otto Frei","offers":[{"title":"Default Title","offer_id":43581635395798,"sku":"846-141","price":10.73,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/ultra-white-14-18-fabrication-master-alloy-per-troy-ounce-otto-frei.jpg?v=1719957478"},{"product_id":"dark-pink-rose-9-18-master-alloy-troy-ounce","title":"Dark Pink-Rose 9-18 All Purpose Master Alloy-Sold By the Troy Ounce (20DWT)","description":"\u003cp\u003eThe Dark Pink-Rose 9–18 All Purpose Master Alloy is a professional-grade casting and fabrication alloy designed for jewelers working across a wide range of gold karatages from 9 to 18 karat. Sold by the troy ounce (20 pennyweight \/ 31.1 grams), this master alloy contains no gold and is formulated to deliver a warm, dark pink-rose color result when alloyed with gold. Its low silver content and high fluidity make it well suited for investment casting as well as bench fabrication work.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eAll-purpose formulation suitable for both casting and fabrication applications\u003c\/li\u003e\n\u003cli\u003eCompatible with 9 to 18 karat gold alloy systems\u003c\/li\u003e\n\u003cli\u003eLow silver content promotes high fluidity for clean casting results\u003c\/li\u003e\n\u003cli\u003eContains no gold — used as a master alloy to be combined with fine gold\u003c\/li\u003e\n\u003cli\u003eDelivers a dark pink-rose color characteristic in finished alloys\u003c\/li\u003e\n\u003cli\u003eSold by the troy ounce (20 DWT \/ 31.1 grams)\u003c\/li\u003e\n\u003cli\u003eProprietary metals are included in the formulation beyond the listed composition\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eKarat Range\u003c\/th\u003e\n\u003ctd\u003e9–18 karat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eColor Result\u003c\/th\u003e\n\u003ctd\u003eDark Pink-Rose\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eCasting and fabrication\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFluidity\u003c\/th\u003e\n\u003ctd\u003eHigh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSilver Content\u003c\/th\u003e\n\u003ctd\u003eLow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGold Content\u003c\/th\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition\u003c\/th\u003e\n\u003ctd\u003eCu 92.5%, Ag 4.5%, Zn 3% (plus proprietary metals)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold By\u003c\/th\u003e\n\u003ctd\u003eTroy ounce (20 DWT \/ 31.1 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eNotes\u003c\/h3\u003e\u003cp\u003eThe listed composition — copper 92.5%, silver 4.5%, zinc 3% — reflects the primary ingredients. The manufacturer includes additional proprietary metals in the formulation that are not disclosed in the composition breakdown. This alloy contains no gold and must be combined with fine gold to produce a finished karat alloy.\u003c\/p\u003e","brand":"Otto Frei","offers":[{"title":"Default Title","offer_id":43581638377686,"sku":"846-150","price":17.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/dark-pink-rose-9-18-all-purpose-master-alloy-sold-by-the-troy-ounce-20dwt-otto-frei.jpg?v=1719957478"},{"product_id":"rich-yellow-stone-in-place-casting-master-alloy","title":"Rich Yellow 9-14 Investment Casting Stone-In-Place-Master Alloy-Per Troy Ounce (20DWT)","description":"\u003cp\u003eRich Yellow Stone-in-Place Investment Casting Master Alloy is formulated for jewelers who require a high-reusability, tarnish-resistant alloy suitable for casting directly with stones in place. Formerly known as \u003cstrong\u003ePeach Klondike Yellow\u003c\/strong\u003e, this master alloy features high silver content and is designed for producing rich yellow 9–14K casting alloys. It is sold by the troy ounce (20 pennyweights or 31.1 grams).\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eFormulated for stone-in-place investment casting applications\u003c\/li\u003e\n\u003cli\u003eHigh reusability — suitable for repeated casting cycles\u003c\/li\u003e\n\u003cli\u003eTarnish-resistant composition for lasting finish quality\u003c\/li\u003e\n\u003cli\u003eHigh silver content for refined color and performance\u003c\/li\u003e\n\u003cli\u003eRich yellow color result appropriate for 9–14K alloy production\u003c\/li\u003e\n\u003cli\u003eFormerly marketed as \u003cstrong\u003ePeach Klondike Yellow\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eStone-in-place investment casting master alloy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTarget Karat Range\u003c\/th\u003e\n\u003ctd\u003e9–14K yellow gold alloys\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition – Copper (Cu)\u003c\/th\u003e\n\u003ctd\u003e68%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition – Silver (Ag)\u003c\/th\u003e\n\u003ctd\u003e23%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition – Zinc (Zn)\u003c\/th\u003e\n\u003ctd\u003e9%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold By\u003c\/th\u003e\n\u003ctd\u003eTroy ounce (20 pennyweights \/ 31.1 grams)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eNotes\u003c\/h3\u003e\u003cp\u003eThis alloy contains proprietary metals in its formulation that are not fully disclosed in the composition listing above. The product may also contain other elements, including silicon. Composition percentages reflect primary constituents only.\u003c\/p\u003e","brand":"Otto Frei","offers":[{"title":"Default Title","offer_id":43581638705366,"sku":"846-158","price":39.8,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/rich-yellow-9-14-investment-casting-stone-in-place-master-alloy-per-troy-ounce-20dwt-otto-frei.jpg?v=1719957478"},{"product_id":"green-yellow-9-18-investment-casting-master-alloy-troy-ounce","title":"Green Yellow 9-18 Investment Casting Master Alloy Per Troy Ounce","description":"\u003cp\u003eThis master alloy produces a distinctive green-yellow shade of gold thanks to its very high silver content. Formulated for investment casting, it delivers excellent results in lost-wax and other casting processes while also performing well as a fabrication alloy. The alloy is highly reusable, tarnish resistant, and produces a very high luster finish. Sold by the troy ounce (20 pennyweight \/ 31.1 grams).\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eProduces a green-yellow gold color with high silver content\u003c\/li\u003e\n\u003cli\u003eExcellent performance as an investment casting alloy\u003c\/li\u003e\n\u003cli\u003eAlso suitable for use as a fabrication alloy\u003c\/li\u003e\n\u003cli\u003eHighly reusable — reduces material waste over time\u003c\/li\u003e\n\u003cli\u003eTarnish resistant with a very high luster\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eSold As\u003c\/th\u003e\n\u003ctd\u003ePer troy ounce (20 pennyweight \/ 31.1 grams)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAlloy Type\u003c\/th\u003e\n\u003ctd\u003eMaster Alloy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePrimary Application\u003c\/th\u003e\n\u003ctd\u003eInvestment casting; fabrication\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGold Color Produced\u003c\/th\u003e\n\u003ctd\u003eGreen-yellow gold\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition – Copper (Cu)\u003c\/th\u003e\n\u003ctd\u003e14.9%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition – Silver (Ag)\u003c\/th\u003e\n\u003ctd\u003e84.1%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition – Zinc (Zn)\u003c\/th\u003e\n\u003ctd\u003e1%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cp\u003eThere are proprietary metals in the formulation that are not reflected in the published composition breakdown above.\u003c\/p\u003e","brand":"Otto Frei","offers":[{"title":"Default Title","offer_id":43581638901974,"sku":"846-184","price":119.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/green-yellow-9-18-investment-casting-master-alloy-per-troy-ounce-otto-frei.jpg?v=1719957478"},{"product_id":"rich-yellow-18k-casting-master-alloy","title":"Rich Yellow 18-22 Investment Casting Master Alloy-Per Troy Ounce (20DWT)","description":"\u003cp\u003eRich Yellow 18–22 Investment Casting Master Alloy delivers a deep, rich yellow color in the classic European style. Featuring a smooth surface and high luster, this alloy is best suited for 18K casting applications and benefits from high silver content for refined results. This formula includes a de-oxidizer, distinguishing it from the standard 846-175ND formulation. \u003cstrong\u003eFormerly called Euro Yellow.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDeep, rich yellow color with European-style character\u003c\/li\u003e\n\u003cli\u003eSmooth surface finish with high luster\u003c\/li\u003e\n\u003cli\u003eOptimized for 18K investment casting\u003c\/li\u003e\n\u003cli\u003eHigh silver content in the alloy composition\u003c\/li\u003e\n\u003cli\u003eIncludes a de-oxidizer — distinguishes it from formula 846-175ND\u003c\/li\u003e\n\u003cli\u003eMay also contain silicon and other proprietary elements not listed in the composition\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eBest Use\u003c\/th\u003e\n\u003ctd\u003e18K Investment Casting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eColor\u003c\/th\u003e\n\u003ctd\u003eDeep Rich Yellow, European Style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCopper (Cu)\u003c\/th\u003e\n\u003ctd\u003e46%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSilver (Ag)\u003c\/th\u003e\n\u003ctd\u003e50%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eZinc (Zn)\u003c\/th\u003e\n\u003ctd\u003e4%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDe-oxidizer Included\u003c\/th\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold By\u003c\/th\u003e\n\u003ctd\u003eTroy ounce (20 pennyweights \/ 31.1 grams)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eProprietary metals are present in this formulation that are not reflected in the listed composition percentages.\u003c\/strong\u003e The alloy may also contain silicon and other elements. The composition section above represents primary constituents only.\u003c\/p\u003e","brand":"Otto Frei","offers":[{"title":"Default Title","offer_id":43581639131350,"sku":"846-175","price":72.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/rich-yellow-18-22-investment-casting-master-alloy-per-troy-ounce-20dwt-otto-frei.jpg?v=1719957474"},{"product_id":"copper-casting-grain-999-pure-troy-ounce","title":"Copper Casting Grain","description":"\u003cp\u003eThis hard-to-find .999 pure copper casting grain is used for alloying with gold and silver. High-purity copper ensures consistent, repeatable results when preparing custom alloys for jewelry casting. Sold by the troy ounce (20 pennyweights \/ 31.1 grams).\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e.999 pure copper casting grain\u003c\/li\u003e\n\u003cli\u003eIdeal for alloying with gold and silver\u003c\/li\u003e\n\u003cli\u003eHigh purity supports consistent, repeatable alloying results\u003c\/li\u003e\n\u003cli\u003eSold by the troy ounce (20 dwt \/ 31.1 g)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCreating custom karat gold alloys\u003c\/li\u003e\n\u003cli\u003eAdjusting silver alloys\u003c\/li\u003e\n\u003cli\u003eGeneral jewelry casting work\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003ePurity\u003c\/th\u003e\n\u003ctd\u003e.999 pure copper\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eForm\u003c\/th\u003e\n\u003ctd\u003eCasting grain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold By\u003c\/th\u003e\n\u003ctd\u003eTroy ounce (20 dwt \/ 31.1 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e","brand":"Otto Frei","offers":[{"title":"Default Title","offer_id":43581639590102,"sku":"846-90","price":4.1,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/copper-casting-grain-otto-frei.jpg?v=1719957474"},{"product_id":"brass-casting-grain-troy-ounce","title":"Brass Casting Grain-Sold by the Troy Ounce","description":"\u003cp\u003eAn ideal choice for sample lines and production casting, this brass casting grain is a clean two-component alloy of copper and zinc — nothing else. Sourced from an East Coast manufacturer of precious metal products, this grain is produced with a strong commitment to purity and compliance with regulations governing lead, mercury, and nickel content. Sold by the troy ounce (20 pennyweights or 31.1 grams).\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003ePure copper and zinc alloy — no additional metals or additives\u003c\/li\u003e\n\u003cli\u003eSourced from an East Coast precious metal manufacturer committed to alloy purity\u003c\/li\u003e\n\u003cli\u003eFormulated to comply with regulations on lead, mercury, and nickel content\u003c\/li\u003e\n\u003cli\u003eWell-suited for sample lines and jewelry casting applications\u003c\/li\u003e\n\u003cli\u003eSold by the troy ounce for precise, flexible purchasing\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition\u003c\/th\u003e\n\u003ctd\u003eCopper and zinc alloy (brass)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eForm\u003c\/th\u003e\n\u003ctd\u003eCasting grain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMelting Temperature\u003c\/th\u003e\n\u003ctd\u003e1922°F (1005°C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold By\u003c\/th\u003e\n\u003ctd\u003eTroy ounce (20 pennyweights \/ 31.1 grams)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompliance\u003c\/th\u003e\n\u003ctd\u003eLead-free, mercury-free, nickel-compliant formulation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e","brand":"Otto Frei","offers":[{"title":"Default Title","offer_id":43581640081622,"sku":"846-91","price":5.31,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/brass-casting-grain-sold-by-the-troy-ounce-otto-frei.jpg?v=1719957474"},{"product_id":"rich-yellow-18-22k-master-alloy-fabricating-casting","title":"Rich Yellow 18-22 Investment Casting \u0026 Fabricating Master Alloy-Suitable for Granulation-Per Troy Ounce (20DWT)","description":"\u003cp\u003eThis rich, deep yellow master alloy is specially formulated for jewelers working in 18K–22K gold fabrication and investment casting. Designed with granulation techniques in mind, it contains no de-oxidizer, making it particularly well-suited for traditional granulation work. The alloy produces a smooth surface with high luster and performs exceptionally in sheet, wire, and tube making. While optimized for fabrication, it is also suitable for investment casting. Sold per troy ounce (20 pennyweights \/ 31.1 grams). \u003cem\u003eContains no gold.\u003c\/em\u003e\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSpecially formulated for granulation — contains no de-oxidizer\u003c\/li\u003e\n\u003cli\u003eDeep, rich yellow color with smooth surface and high luster\u003c\/li\u003e\n\u003cli\u003eExcellent for sheet, wire, and tube fabrication\u003c\/li\u003e\n\u003cli\u003eSuitable for investment casting as well as fabrication\u003c\/li\u003e\n\u003cli\u003eBest performance as an 18K alloy\u003c\/li\u003e\n\u003cli\u003eContains no gold\u003c\/li\u003e\n\u003cli\u003eNote: Proprietary metals are present in the formulation and are not fully disclosed in the composition listing\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eRecommended Karat Range\u003c\/th\u003e\n\u003ctd\u003e18K–22K\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePrimary Application\u003c\/th\u003e\n\u003ctd\u003eFabrication (sheet, wire, tube); investment casting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGranulation Suitable\u003c\/th\u003e\n\u003ctd\u003eYes — no de-oxidizer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eContains Gold\u003c\/th\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCopper (Cu)\u003c\/th\u003e\n\u003ctd\u003e46.25%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSilver (Ag)\u003c\/th\u003e\n\u003ctd\u003e50%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eZinc (Zn)\u003c\/th\u003e\n\u003ctd\u003e3.75%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold By\u003c\/th\u003e\n\u003ctd\u003eTroy ounce (20 DWT \/ 31.1 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eNotes\u003c\/h3\u003e\u003cp\u003eThis alloy contains proprietary metals in addition to the listed composition. The disclosed percentages (Cu 46.25%, Ag 50%, Zn 3.75%) do not represent the complete formulation. Sold by the troy ounce, equal to 20 pennyweights or 31.1 grams.\u003c\/p\u003e","brand":"Otto Frei","offers":[{"title":"Default Title","offer_id":43581640245462,"sku":"846-175ND","price":91.3,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/rich-yellow-18-22-investment-casting-and-fabricating-master-alloy-suitable-for-granulation-per-troy-ounce-20dwt-otto-frei.jpg?v=1719957474"},{"product_id":"manganese-bronze-casting-alloy","title":"Manganese Bronze Casting Alloy by the Pound","description":"\u003cp\u003eJewelers Manganese Bronze is a casting alloy developed to provide jewelry casters with a base metal suitable for both centrifugal and vacuum casting applications. When properly finished, this alloy produces a bright lemon yellow color, making it an attractive option for base metal jewelry production. It is a proprietary formulation composed of approximately 60% copper (Cu) and approximately 35% zinc (Zn), with small amounts of additional metals.\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSuitable for both centrifugal and vacuum casting methods\u003c\/li\u003e\n\u003cli\u003eProduces a bright lemon yellow color when properly finished\u003c\/li\u003e\n\u003cli\u003eProprietary alloy formulation designed specifically for jewelry casting\u003c\/li\u003e\n\u003cli\u003ePouring range of 1700°F–2100°F\u003c\/li\u003e\n\u003cli\u003eBase metal alternative for jewelry casters\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition\u003c\/th\u003e\n\u003ctd\u003eApproximately 60% copper (Cu), approximately 35% zinc (Zn), plus small amounts of other metals\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAlloy Type\u003c\/th\u003e\n\u003ctd\u003eManganese Bronze (proprietary)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePouring Range\u003c\/th\u003e\n\u003ctd\u003e1700°F–2100°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish Color\u003c\/th\u003e\n\u003ctd\u003eBright lemon yellow (when properly finished)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Casting Methods\u003c\/th\u003e\n\u003ctd\u003eCentrifugal, vacuum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold By\u003c\/th\u003e\n\u003ctd\u003ePound\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e","brand":"Otto Frei","offers":[{"title":"Default Title","offer_id":43581652336854,"sku":"143.301","price":28.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/manganese-bronze-casting-alloy-by-the-pound-otto-frei.jpg?v=1719957470"},{"product_id":"re-cast-it-gold-casting-additive-2oz","title":"2 Ounce Pack-Re-Cast-It Gold Alloy Refresher-Replenisher","description":"\u003cp\u003e\u003cstrong\u003eRe-Cast-It\u003c\/strong\u003e is an alloy additive designed for recasting old or scrap yellow gold. It does not contain gold and is not a substitute for gold, but when mixed with scrap yellow gold and some fresh fine gold, it helps restore castings to a bright, clean finish. Each pack contains \u003cstrong\u003e2 troy ounces (40 DWT)\u003c\/strong\u003e of Re-Cast-It alloy refresher and replenisher.\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCleans old gold castings, restoring a bright yellow \"new gold\" appearance\u003c\/li\u003e\n\u003cli\u003eHelps eliminate porosity in castings\u003c\/li\u003e\n\u003cli\u003eImproves metal fluidity during casting\u003c\/li\u003e\n\u003cli\u003eReduces reddish surface discoloration common in recast gold\u003c\/li\u003e\n\u003cli\u003eDe-oxidizes used gold during the casting process\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e2 troy ounces (40 DWT)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGold Content\u003c\/th\u003e\n\u003ctd\u003eContains no gold\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eIntended Use\u003c\/th\u003e\n\u003ctd\u003eAlloy additive for recasting scrap yellow gold\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eMixing Ratios\u003c\/h3\u003e\n\u003cp\u003eThe following ratios apply per 100 DWT of scrap gold:\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eScrap Karat\u003c\/th\u003e\n\u003cth\u003eRe-Cast-It\u003c\/th\u003e\n\u003cth\u003eFine Gold to Add\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e10K\u003c\/td\u003e\n\u003ctd\u003e5 DWT\u003c\/td\u003e\n\u003ctd\u003e3.57 DWT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e14K\u003c\/td\u003e\n\u003ctd\u003e2 DWT\u003c\/td\u003e\n\u003ctd\u003e2.82 DWT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e18K\u003c\/td\u003e\n\u003ctd\u003e1 DWT\u003c\/td\u003e\n\u003ctd\u003e3.00 DWT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cp\u003eFor \u003cstrong\u003ewhite gold\u003c\/strong\u003e, these ratios may be used, but effectiveness is limited to 1–2 cycles due to yellowing. When continuously reusing scrap combined with fresh metal, use half the above amounts to avoid excessive deoxidizer buildup.\u003c\/p\u003e\n\n\u003ch3\u003eMelting Instructions\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003ePlace Re-Cast-It at the bottom of the crucible, then place scrap on top.\u003c\/li\u003e\n\u003cli\u003eOnce molten, stir with a \u003cstrong\u003ecarbon rod\u003c\/strong\u003e for gas-fired or torch melts, or a \u003cstrong\u003equartz rod\u003c\/strong\u003e for electric induction melts.\u003c\/li\u003e\n\u003cli\u003eFluxing with boric acid may be required depending on the condition of the scrap.\u003c\/li\u003e\n\u003cli\u003eBest results are achieved when scrap is free of oxides and investment powder residue.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cp\u003e\u003cem\u003eIf gold is contaminated with cuprous oxide (red oxide), only limited positive results can be expected. Re-Cast-It is not a substitute for gold and will not alter the karat of the alloy on its own.\u003c\/em\u003e\u003c\/p\u003e","brand":"Otto Frei","offers":[{"title":"Default Title","offer_id":43581682254038,"sku":"122.607","price":26.75,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/2-ounce-pack-re-cast-it-gold-alloy-refresher-replenisher-otto-frei.jpg?v=1719957457"},{"product_id":"dark-pink-rose-9-18k-fabrication-rolling-master-alloy-no-de-ox","title":"Dark Pink Rose 9-18K Fabrication Rolling Master Alloy-Per Troy Ounce (20DWT)","description":"\u003cp\u003eCopper gives rose and pink gold alloys their characteristic warm hue, but it also reduces workability — making setting and fabrication more challenging. This \u003cstrong\u003eDark Pink Rose Fabrication Rolling Master Alloy\u003c\/strong\u003e is specifically formulated without De-Ox, the additive used in casting alloys to protect the melt during the casting process. While De-Ox serves an important function in casting, it also introduces brittleness that makes the resulting alloy harder to work by hand or with rolling equipment. By omitting De-Ox entirely, this alloy delivers superior malleability and ductility for bench fabrication.\u003c\/p\u003e\u003cp\u003eSuitable for alloying with 9K through 18K gold, this master alloy is designed for metalsmiths and jewelers who roll, draw, forge, or fabricate pink and rose gold components. \u003cstrong\u003eThis alloy offers the best workability of all pink alloys in the Otto Frei lineup\u003c\/strong\u003e, making it the preferred choice for fabrication work where ease of forming and finishing matters.\u003c\/p\u003e\u003cp\u003eNote that this alloy is distinct from casting alloy 846-150. The only difference between the two is the absence of De-Ox in this formulation. If you are casting, use the casting-specific alloy. If you are fabricating, this is the correct choice.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eFormulated without De-Ox for superior workability in fabrication and rolling applications\u003c\/li\u003e\n\u003cli\u003eBest workability of all pink master alloys offered — ideal for rolling, drawing, and forging\u003c\/li\u003e\n\u003cli\u003eCompatible with 9K–18K gold alloy systems\u003c\/li\u003e\n\u003cli\u003eProduces warm pink and rose gold color tones through high copper content\u003c\/li\u003e\n\u003cli\u003eDistinct from casting alloy 846-150 — optimized specifically for fabrication\u003c\/li\u003e\n\u003cli\u003eSold by the troy ounce (20 pennyweights \/ 31.1 grams)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eColor Result\u003c\/th\u003e\n\u003ctd\u003eDark Pink \/ Rose\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKarat Range\u003c\/th\u003e\n\u003ctd\u003e9K–18K\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eFabrication and rolling; not intended for casting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDe-Ox\u003c\/th\u003e\n\u003ctd\u003eNone — De-Ox free formulation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition: Copper (Cu)\u003c\/th\u003e\n\u003ctd\u003e94%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition: Silver (Ag)\u003c\/th\u003e\n\u003ctd\u003e4.5%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition: Zinc (Zn)\u003c\/th\u003e\n\u003ctd\u003e1.5%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold By\u003c\/th\u003e\n\u003ctd\u003eTroy ounce (20 pennyweights \/ 31.1 grams)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eNotes\u003c\/h3\u003e\u003cp\u003eThere are proprietary metals in the formulation that are not disclosed in the composition listing above. For casting applications, use casting alloy 846-150 instead of this product.\u003c\/p\u003e","brand":"Otto Frei","offers":[{"title":"Default Title","offer_id":43582909448406,"sku":"846-151ND","price":19.75,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/dark-pink-rose-9-18k-fabrication-rolling-master-alloy-per-troy-ounce-20dwt-otto-frei.jpg?v=1719956810"},{"product_id":"yellow-14k-18k-enameling-master-alloy-no-zinc","title":"Standard Yellow 14-18 Fabrication \u0026 Enameling Master Alloy-No Zinc","description":"\u003cp\u003eThis standard yellow master alloy is formulated for 14K and 18K gold fabrication and for glass enameling applications. Because it contains \u003cstrong\u003eno zinc\u003c\/strong\u003e, it is safe for use in glass enameling processes where zinc would cause problems. It can also be used for 14K and 18K casting when desired. It contains no gold.\u003c\/p\u003e\u003cp\u003eWith a high silver content and a clean, zinc-free formulation, this alloy delivers consistent color and workability for fabrication work. Formerly known as \u003cem\u003eRich Yellow All Enameling Alloy 80E No Zinc\u003c\/em\u003e.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eZinc-free formula — safe for glass enameling\u003c\/li\u003e\n\u003cli\u003eSuitable for 14K and 18K fabrication and casting\u003c\/li\u003e\n\u003cli\u003eHigh silver content for consistent yellow color\u003c\/li\u003e\n\u003cli\u003eContains no gold\u003c\/li\u003e\n\u003cli\u003eSold by the troy ounce (20 pennyweights or 31.1 grams)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition\u003c\/th\u003e\n\u003ctd\u003eCu 40%, Ag 60%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eZinc Content\u003c\/th\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGold Content\u003c\/th\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRecommended Use\u003c\/th\u003e\n\u003ctd\u003e14K–18K fabrication and glass enameling; also suitable for 14K–18K casting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold By\u003c\/th\u003e\n\u003ctd\u003eTroy ounce (20 pennyweights \/ 31.1 grams)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eNotes\u003c\/h3\u003e\u003cp\u003eThere are proprietary metals in the formulation which are not fully disclosed in the composition listing. The alloy may also contain other elements, including silicon. Formerly called \u003cem\u003eRich Yellow All Enameling Alloy 80E No Zinc\u003c\/em\u003e.\u003c\/p\u003e","brand":"Otto Frei","offers":[{"title":"Default Title","offer_id":43583688999126,"sku":"846-180","price":86.65,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/rich-yellow-all-enameling-alloy-80e-no-zinc-otto-frei.jpg?v=1719956544"},{"product_id":"ultra-rich-reddish-yellow-master-alloy-9k-14k-stone-in-place-casting","title":"Ultra Rich Reddish Yellow 9-14 Investment Casting Stone In Place Master Alloy-Contains No Gold Per Troy Ounce (20 DWT)","description":"\u003cp\u003eThe Ultra Rich Reddish Yellow Master Alloy is a high-performance investment casting alloy engineered for stone-in-place casting applications. Part of the Ultra Line of casting alloys, this master alloy produces a rich reddish yellow color when combined with fine gold to yield alloys in the 9K–14K range. It features notably high silver content, contributing to its excellent tarnish resistance and casting reusability. This alloy contains no gold and is sold by the troy ounce.\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePart of the \u003cstrong\u003eUltra Line\u003c\/strong\u003e of high-performance casting alloys\u003c\/li\u003e\n\u003cli\u003eFormulated for \u003cstrong\u003estone-in-place investment casting\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eProduces a \u003cstrong\u003erich reddish yellow\u003c\/strong\u003e color when alloyed with fine gold\u003c\/li\u003e\n\u003cli\u003eCompatible with alloy targets in the \u003cstrong\u003e9K–14K\u003c\/strong\u003e range\u003c\/li\u003e\n\u003cli\u003eHigh silver content for enhanced tarnish resistance\u003c\/li\u003e\n\u003cli\u003eHigh reusability for efficient production workflows\u003c\/li\u003e\n\u003cli\u003eContains no gold\u003c\/li\u003e\n\u003cli\u003eProprietary metals are included in the formulation; may also contain silicon or other elements\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eAlloy Line\u003c\/th\u003e\n\u003ctd\u003eUltra Line High Performance Casting Alloys\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eStone-in-place investment casting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eColor (when alloyed with fine gold)\u003c\/th\u003e\n\u003ctd\u003eRich reddish yellow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTarget Karat Range\u003c\/th\u003e\n\u003ctd\u003e9K–14K\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGold Content\u003c\/th\u003e\n\u003ctd\u003eNone (contains no gold)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition – Copper (Cu)\u003c\/th\u003e\n\u003ctd\u003e65%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition – Silver (Ag)\u003c\/th\u003e\n\u003ctd\u003e23%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition – Zinc\u003c\/th\u003e\n\u003ctd\u003e12%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAdditional Elements\u003c\/th\u003e\n\u003ctd\u003eProprietary metals; may also contain silicon and other elements\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold By\u003c\/th\u003e\n\u003ctd\u003eTroy ounce (20 pennyweights \/ 31.1 grams)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cp\u003eThe composition listed reflects the primary declared elements. Proprietary metals are present in the formulation and are not fully disclosed. The alloy may also contain silicon or other elements not listed in the composition breakdown.\u003c\/p\u003e","brand":"Otto Frei","offers":[{"title":"Default Title","offer_id":44245842657494,"sku":"846-101U","price":39.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/ultra-rich-reddish-yellow-9-14-investment-casting-stone-in-place-master-alloy-contains-no-gold-per-troy-ounce-20-dwt-otto-frei.jpg?v=1719954196"},{"product_id":"bright-yellow-master-alloy-9k-14k-investment-casting-troy-ounce","title":"Bright Yellow 9-14 Investment Casting Master Alloy-Contains No Gold Per Troy Ounce (20 DWT)","description":"\u003cp\u003eThis bright yellow master alloy is formulated for investment casting and open torch melting, producing a vivid yellow color when alloyed with fine gold to yield karat gold between 9K and 14K. It features a low silver content compared to many gold alloys, and its high reusability makes it an economical choice for production casting environments. Sold by the troy ounce (20 pennyweights \/ 31.1 grams).\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eProduces a \u003cstrong\u003ebright yellow\u003c\/strong\u003e color when combined with fine gold\u003c\/li\u003e\n\u003cli\u003eSuitable for alloying to \u003cstrong\u003e9K–14K\u003c\/strong\u003e gold\u003c\/li\u003e\n\u003cli\u003eOptimized for \u003cstrong\u003einvestment casting\u003c\/strong\u003e and \u003cstrong\u003eopen torch melting\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eHigh reusability—economical for repeated casting cycles\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow silver content\u003c\/strong\u003e compared to many gold master alloys\u003c\/li\u003e\n\u003cli\u003eContains no gold—priced per troy ounce of alloy only\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition\u003c\/th\u003e\n\u003ctd\u003eCopper (Cu) 73.75%, Silver (Ag) 11.25%, Zinc (Zn) 15%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAdditional Elements\u003c\/th\u003e\n\u003ctd\u003eMay contain proprietary metals, silicon, and other elements not listed in the composition\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGold Content\u003c\/th\u003e\n\u003ctd\u003eContains no gold\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKarat Range\u003c\/th\u003e\n\u003ctd\u003e9K–14K (when alloyed with fine gold)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eColor Result\u003c\/th\u003e\n\u003ctd\u003eBright yellow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMelting Method\u003c\/th\u003e\n\u003ctd\u003eOpen torch; investment casting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold By\u003c\/th\u003e\n\u003ctd\u003eTroy ounce (20 pennyweights \/ 31.1 grams)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eNotes\u003c\/h3\u003e\u003cp\u003eThe composition listing (Cu, Ag, Zn) does not represent the complete formulation. Proprietary metals are present in the alloy and are not disclosed. The alloy may also contain silicon or other trace elements. Always follow safe handling practices when melting and casting alloy materials.\u003c\/p\u003e","brand":"Otto Frei","offers":[{"title":"Default Title","offer_id":44245842690262,"sku":"846-200","price":24.2,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/bright-yellow-9-14-investment-casting-master-alloy-contains-no-gold-per-troy-ounce-20-dwt-otto-frei.jpg?v=1719954196"},{"product_id":"european-greenish-yellow-master-alloy-9k-14k-investment-casting","title":"European Greenish Yellow 9-14 Investment Casting Master Alloy-Contains No Gold Per Troy Ounce (20 DWT)","description":"\u003cp\u003eThis European-shade master alloy is formulated for investment casting and delivers a distinctive \u003cstrong\u003egreenish yellow\u003c\/strong\u003e color when alloyed with fine gold — the traditional European interpretation of yellow gold. Suitable for producing alloys in the \u003cstrong\u003e9K to 14K\u003c\/strong\u003e range, it features a high silver content that contributes to its characteristic hue and working properties. It is noted for good reusability with torch casting.\u003c\/p\u003e\u003cp\u003eThe alloy is sold by the troy ounce (20 pennyweights \/ 31.1 grams) and contains no gold.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eProduces a greenish yellow color traditionally associated with European-shade yellow gold\u003c\/li\u003e\n\u003cli\u003eCompatible with fine gold for alloying in the 9K–14K range\u003c\/li\u003e\n\u003cli\u003eHigh silver content contributes to characteristic color and performance\u003c\/li\u003e\n\u003cli\u003eGood reusability; suitable for torch casting investment casting applications\u003c\/li\u003e\n\u003cli\u003eContains no gold — sold as a master alloy only\u003c\/li\u003e\n\u003cli\u003eSold by the troy ounce (20 DWT \/ 31.1 g)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition – Copper (Cu)\u003c\/th\u003e\n\u003ctd\u003e57%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition – Silver (Ag)\u003c\/th\u003e\n\u003ctd\u003e27.5%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition – Zinc\u003c\/th\u003e\n\u003ctd\u003e15.5%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGold Content\u003c\/th\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eColor Result\u003c\/th\u003e\n\u003ctd\u003eGreenish yellow (European shade)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKarat Range\u003c\/th\u003e\n\u003ctd\u003e9K–14K (when alloyed with fine gold)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCasting Method\u003c\/th\u003e\n\u003ctd\u003eInvestment casting (torch)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold By\u003c\/th\u003e\n\u003ctd\u003eTroy ounce (20 DWT \/ 31.1 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eNotes\u003c\/h3\u003e\u003cp\u003eThere are proprietary metals in the formulation that are not reflected in the composition listed above. The alloy may also contain other elements including silicon. The percentages shown represent the primary disclosed constituents only.\u003c\/p\u003e","brand":"Otto Frei","offers":[{"title":"Default Title","offer_id":44245842755798,"sku":"846-264","price":46.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/european-greenish-yellow-9-14-investment-casting-master-alloy-contains-no-gold-per-troy-ounce-20-dwt-otto-frei.jpg?v=1719954196"},{"product_id":"deep-yellow-790-18k-casting-master-alloy-troy-ounce","title":"Deep Yellow 18 Casting Master Alloy-Sold Per Troy Ounce (20DWT)","description":"\u003cp\u003eThe Deep Yellow 790 Casting Master Alloy delivers a deep, rich yellow color with a European style finish. Formulated specifically as an \u003cstrong\u003e18K casting alloy\u003c\/strong\u003e, it produces a smooth surface with high luster and contains a built-in de-oxidizer for cleaner casting results. Compared to the 846-175 Master Alloy, this formulation uses more copper and less silver, resulting in its characteristically warm, saturated yellow tone. It is \u003cstrong\u003enickel free\u003c\/strong\u003e and sold by the troy ounce (20 pennyweights or 31.1 grams).\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eDeep, rich yellow color with European style aesthetic\u003c\/li\u003e\n\u003cli\u003eSmooth surface finish with high luster\u003c\/li\u003e\n\u003cli\u003eIncludes a de-oxidizer in the formulation\u003c\/li\u003e\n\u003cli\u003eBest suited for use as an 18K casting alloy\u003c\/li\u003e\n\u003cli\u003eHigher copper content and lower silver content than the 846-175 Master Alloy\u003c\/li\u003e\n\u003cli\u003eNickel free formulation\u003c\/li\u003e\n\u003cli\u003eSold by the troy ounce (20 pennyweights \/ 31.1 grams)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eAlloy Color\u003c\/th\u003e\n\u003ctd\u003eDeep Yellow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRecommended Use\u003c\/th\u003e\n\u003ctd\u003e18K Casting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCopper (Cu)\u003c\/th\u003e\n\u003ctd\u003e53%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSilver (Ag)\u003c\/th\u003e\n\u003ctd\u003e44%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eZinc (Zn)\u003c\/th\u003e\n\u003ctd\u003e3%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNickel Free\u003c\/th\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDe-oxidizer Included\u003c\/th\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold By\u003c\/th\u003e\n\u003ctd\u003eTroy ounce (20 DWT \/ 31.1 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eNotes\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eThere are proprietary metals in the formulation that are not included in the composition section.\u003c\/strong\u003e The alloy may also contain other elements, including silicon. The percentages listed reflect the primary disclosed composition only.\u003c\/p\u003e","brand":"Otto Frei","offers":[{"title":"Default Title","offer_id":44245842821334,"sku":"846-790","price":65.3,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/deep-yellow-18-casting-master-alloy-sold-per-troy-ounce-20dwt-otto-frei.jpg?v=1726697568"},{"product_id":"greenish-yellow-18k-casting-master-alloy-nickel-free","title":"Greenish Yellow 18 Casting Master Alloy-Per Troy Ounce (20DWT)","description":"\u003cp\u003eThis \u003cstrong\u003eGreenish Yellow 18K Casting Master Alloy\u003c\/strong\u003e delivers a distinctive European-style greenish yellow color with the highest silver content of all 18K master alloys in its class. Formulated with a built-in de-oxidizer, it produces a smooth surface and high luster finish, making it an excellent choice for 18K casting applications. Completely \u003cstrong\u003enickel free\u003c\/strong\u003e, this alloy is well-suited for jewelers working with clients who have metal sensitivities. Sold by the troy ounce (20 pennyweights or 31.1 grams).\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGreenish yellow color with European-style aesthetic\u003c\/li\u003e\n\u003cli\u003eHighest silver content of all 18K master alloys in this line\u003c\/li\u003e\n\u003cli\u003eIncludes a built-in de-oxidizer for cleaner casting results\u003c\/li\u003e\n\u003cli\u003eSmooth surface and high luster finish\u003c\/li\u003e\n\u003cli\u003eNickel free formulation\u003c\/li\u003e\n\u003cli\u003eBest suited for use as an 18K casting alloy\u003c\/li\u003e\n\u003cli\u003eSold by the troy ounce (20 pennyweights \/ 31.1 grams)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eKarat\u003c\/th\u003e\n\u003ctd\u003e18K\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eColor\u003c\/th\u003e\n\u003ctd\u003eGreenish Yellow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCopper (Cu)\u003c\/th\u003e\n\u003ctd\u003e24%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSilver (Ag)\u003c\/th\u003e\n\u003ctd\u003e72.8%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eZinc (Zn)\u003c\/th\u003e\n\u003ctd\u003e3.2%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNickel\u003c\/th\u003e\n\u003ctd\u003eNickel Free\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDe-oxidizer\u003c\/th\u003e\n\u003ctd\u003eIncluded in formulation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePrimary Use\u003c\/th\u003e\n\u003ctd\u003e18K Casting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold By\u003c\/th\u003e\n\u003ctd\u003eTroy ounce (20 pennyweights \/ 31.1 grams)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eNotes\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e There are proprietary metals in the formulation that are not listed in the composition section. The alloy may also contain other elements, including silicon.\u003c\/p\u003e","brand":"Otto Frei","offers":[{"title":"Default Title","offer_id":44245842886870,"sku":"846-760","price":103.66,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/greenish-yellow-18-casting-master-alloy-per-troy-ounce-20dwt-otto-frei.jpg?v=1726697569"},{"product_id":"premium-pink-9k-14k-casting-master-alloy-troy-ounce","title":"Premium Pink 9-14 Casting Master Alloy-Sold Per Troy Ounce (20DWT)","description":"\u003cp\u003e\u003cstrong\u003ePremium Pink 9–14K Casting Master Alloy\u003c\/strong\u003e is formulated for jewelers and casters who demand a rich, consistent pink color result in gold alloys ranging from 9K to 14K. Engineered for high fluidity, this alloy performs reliably in open melt systems, including both torch and electric melt setups. The result is a smooth surface with high luster — ideal for finished casting work where surface quality matters.\u003c\/p\u003e\u003cp\u003eThis alloy includes a built-in de-oxidizer, reducing the need for additional fluxing steps and helping produce cleaner castings. The formulation is designed as a true casting alloy, not a general-purpose master alloy, making it a precise tool for production and studio casting alike.\u003c\/p\u003e\u003cp\u003eSold by the troy ounce (20 pennyweights \/ 31.1 grams).\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eRich premium pink color result in 9K to 14K gold alloys\u003c\/li\u003e\n\u003cli\u003eHigh fluidity formula optimized for open melt systems\u003c\/li\u003e\n\u003cli\u003eCompatible with torch and electric melt processes\u003c\/li\u003e\n\u003cli\u003eIncludes a de-oxidizer in the formulation\u003c\/li\u003e\n\u003cli\u003eProduces smooth surface finish with high luster\u003c\/li\u003e\n\u003cli\u003eBest suited as a 9K to 14K casting alloy\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eRecommended Karat Range\u003c\/th\u003e\n\u003ctd\u003e9K – 14K\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eColor Result\u003c\/th\u003e\n\u003ctd\u003ePremium Pink\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFluidity\u003c\/th\u003e\n\u003ctd\u003eHigh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMelt System Compatibility\u003c\/th\u003e\n\u003ctd\u003eOpen melt — torch and electric\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDe-oxidizer Included\u003c\/th\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCopper (Cu)\u003c\/th\u003e\n\u003ctd\u003e95%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSilver (Ag)\u003c\/th\u003e\n\u003ctd\u003e3.5%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eZinc (Zn)\u003c\/th\u003e\n\u003ctd\u003e1.5%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eUnit of Sale\u003c\/th\u003e\n\u003ctd\u003ePer troy ounce (20 DWT \/ 31.1 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eNotes\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eProprietary metals are present in this formulation that are not disclosed in the composition listing above.\u003c\/strong\u003e The alloy may also contain other elements, including silicon. The listed percentages reflect primary constituents only and do not represent the complete formulation.\u003c\/p\u003e","brand":"Otto Frei","offers":[{"title":"Default Title","offer_id":44245842952406,"sku":"846-540","price":16.4,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/premium-pink-9-14-casting-master-alloy-sold-per-troy-ounce-20dwt-otto-frei.jpg?v=1726697571"},{"product_id":"pink-9k-18k-casting-fabricating-master-alloy-troy-ounce","title":"All Purpose Pink 9-18 Casting\/Fabricating Master Alloy-Sold Per Troy Ounce (20DWT)","description":"\u003cp\u003e\u003cstrong\u003eAll Purpose Pink 9–18 Casting \u0026amp; Fabricating Master Alloy\u003c\/strong\u003e is a versatile master alloy formulated to cover a wide range of duties in both casting and fabricating applications. Designed for use across gold alloys from 9K through 18K, this pink-toned alloy is a practical choice for jewelers and metalsmiths who need a single master alloy that performs reliably across multiple karat ranges.\u003c\/p\u003e\u003cp\u003eSold per troy ounce (20 pennyweights \/ 31.1 grams).\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSuitable for both casting and fabricating workflows\u003c\/li\u003e\n\u003cli\u003eCompatible with gold alloys ranging from 9K to 18K\u003c\/li\u003e\n\u003cli\u003eProduces a pink color tone in finished alloys\u003c\/li\u003e\n\u003cli\u003eSold in convenient troy ounce (20 DWT \/ 31.1 g) units\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition\u003c\/th\u003e\n\u003ctd\u003eCu 93%, Ag 4%, Zn 3% (see note)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eColor Tone\u003c\/th\u003e\n\u003ctd\u003ePink\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKarat Range\u003c\/th\u003e\n\u003ctd\u003e9K–18K\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplications\u003c\/th\u003e\n\u003ctd\u003eCasting, Fabricating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold Per\u003c\/th\u003e\n\u003ctd\u003eTroy ounce (20 pennyweights \/ 31.1 grams)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eNotes\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e This alloy contains proprietary metals not included in the composition listed above. It may also contain other elements, including silicon.\u003c\/p\u003e","brand":"Otto Frei","offers":[{"title":"Default Title","offer_id":44245843017942,"sku":"846-548","price":16.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/all-purpose-pink-9-18-castingfabricating-master-alloy-sold-per-troy-ounce-20dwt-otto-frei.jpg?v=1726697572"},{"product_id":"sterling-classic-white-alloy-925-master","title":"Sterling-Classic White Alloy","description":"\u003cp\u003eA general-purpose master alloy for alloying with pure silver to produce .925 sterling silver. Sterling-Classic White Alloy delivers a classic white color and is well suited for both casting and fabrication applications. Sold per troy ounce (20 pennyweights \/ 31.1 grams).\u003c\/p\u003e\u003cp\u003eThis alloy is formulated with less zinc and more copper compared to the Super White 846-597N alloy, making it a distinct choice for jewelers who prefer that specific balance of workability and finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eContains no silver.\u003c\/strong\u003e The alloy is heat treatable, exhibits high fluidity during casting, and offers good tarnish resistance.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eClassic white color for alloying with pure silver to .925 sterling silver\u003c\/li\u003e\n\u003cli\u003eSuitable for both casting and fabrication\u003c\/li\u003e\n\u003cli\u003eHeat treatable for improved hardness and workability\u003c\/li\u003e\n\u003cli\u003eHigh fluidity for clean, consistent casting results\u003c\/li\u003e\n\u003cli\u003eGood tarnish resistance for finished pieces\u003c\/li\u003e\n\u003cli\u003eLower zinc, higher copper content compared to Super White 846-597N alloy\u003c\/li\u003e\n\u003cli\u003eContains no silver — pure master alloy formulation\u003c\/li\u003e\n\u003cli\u003eSold per troy ounce (20 DWT \/ 31.1 grams)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eColor\u003c\/th\u003e\n\u003ctd\u003eClassic White\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition – Copper (Cu)\u003c\/th\u003e\n\u003ctd\u003e69%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition – Zinc (Zn)\u003c\/th\u003e\n\u003ctd\u003e30%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition – Tin (Sn)\u003c\/th\u003e\n\u003ctd\u003e1%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSilver Content\u003c\/th\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHeat Treatable\u003c\/th\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFluidity\u003c\/th\u003e\n\u003ctd\u003eHigh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTarnish Resistance\u003c\/th\u003e\n\u003ctd\u003eGood\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold By\u003c\/th\u003e\n\u003ctd\u003eTroy ounce (20 pennyweights \/ 31.1 grams)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eNotes\u003c\/h3\u003e\u003cp\u003eThere are proprietary metals in the formulation that are not included in the composition listing above. The alloy may also contain silicon and deoxidizers. Mix with pure silver to produce .925 sterling silver.\u003c\/p\u003e","brand":"Otto Frei","offers":[{"title":"Default Title","offer_id":44245843116246,"sku":"846-588","price":8.54,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/sterling-classic-white-alloy-otto-frei.jpg?v=1721164249"},{"product_id":"sterling-super-white-master-alloy-925-casting","title":"Sterling-Super White Alloy","description":"\u003cp\u003eSterling-Super White Alloy is a general-purpose master alloy designed for alloying with pure silver to produce .925 sterling silver. Suitable for both casting and fabrication, this alloy delivers a super white color result and is formulated with more zinc and less copper compared to the Classic White alloy (846-588). It contains no silver and is sold per troy ounce (20 pennyweights \/ 31.1 grams).\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSuper white color when alloyed with fine silver to .925 sterling\u003c\/li\u003e\n\u003cli\u003eSuitable for casting and fabrication applications\u003c\/li\u003e\n\u003cli\u003eHeat treatable for added versatility\u003c\/li\u003e\n\u003cli\u003eHigh fluidity for reliable casting performance\u003c\/li\u003e\n\u003cli\u003eGood tarnish resistance\u003c\/li\u003e\n\u003cli\u003eContains no silver — add to pure silver to achieve .925 sterling\u003c\/li\u003e\n\u003cli\u003eHigher zinc and lower copper content compared to Classic White 846-588\u003c\/li\u003e\n\u003cli\u003eMay also contain silicon and deoxidizers; formulation includes proprietary metals not fully disclosed in composition\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition\u003c\/th\u003e\n\u003ctd\u003eCu 65%, Zn 35% (plus proprietary metals, may include silicon and deoxidizers)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSilver Content\u003c\/th\u003e\n\u003ctd\u003eNone — master alloy only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTarget Alloy\u003c\/th\u003e\n\u003ctd\u003e.925 Sterling Silver\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eColor Result\u003c\/th\u003e\n\u003ctd\u003eSuper White\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold By\u003c\/th\u003e\n\u003ctd\u003eTroy ounce (20 pennyweights \/ 31.1 grams)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHeat Treatable\u003c\/th\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTarnish Resistance\u003c\/th\u003e\n\u003ctd\u003eGood\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cp\u003eThis alloy contains proprietary metals not fully listed in the composition breakdown. The formulation may also include silicon and deoxidizers. For a classic white result with a different Cu\/Zn ratio, refer to Classic White alloy 846-588.\u003c\/p\u003e","brand":"Otto Frei","offers":[{"title":"Default Title","offer_id":44245843181782,"sku":"846-597N","price":11.74,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/sterling-super-white-alloy-otto-frei.jpg?v=1719954189"},{"product_id":"ultra-white-9k-18k-stone-in-place-nickel-casting-master-alloy","title":"Ultra White 9K-18K Stone-In-Place Nickel Alloy","description":"\u003cp\u003eUltra White 9K–18K Stone-In-Place Investment Casting Master Alloy is formulated for excellent fluidity during casting and fabrication applications. \u003cstrong\u003eContains no gold.\u003c\/strong\u003e Sold by the troy ounce (20 pennyweights \/ 31.1 grams).\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eEngineered for stone-in-place investment casting with excellent metal fluidity\u003c\/li\u003e\n\u003cli\u003eCompatible with 9K through 18K gold formulations when pre-alloyed with fine gold\u003c\/li\u003e\n\u003cli\u003eSuitable for both casting and fabrication applications\u003c\/li\u003e\n\u003cli\u003eContains no gold — a true master alloy for alloying to karat\u003c\/li\u003e\n\u003cli\u003eGypsum bonded investment recommended for best results\u003c\/li\u003e\n\u003cli\u003eFluoride-based investment removers recommended for silicon oxide coating removal\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition\u003c\/th\u003e\n\u003ctd\u003eCu 53%, Ag 20%, Zn 10%, Ni 17% (plus proprietary metals; may also contain silicon and deoxidizers)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eContains Gold\u003c\/th\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold By\u003c\/th\u003e\n\u003ctd\u003eTroy ounce (20 pennyweights \/ 31.1 grams)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePre-Alloying Temperature (9K–18K)\u003c\/th\u003e\n\u003ctd\u003e1050°C – 1060°C \/ 1922°F – 1940°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCasting Temp – 10K Alloyed Grain\u003c\/th\u003e\n\u003ctd\u003e960°C – 980°C \/ 1760°F – 1796°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCasting Temp – 14K Alloyed Grain\u003c\/th\u003e\n\u003ctd\u003e985°C – 1005°C \/ 1805°F – 1841°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCasting Temp – 18K Alloyed Grain\u003c\/th\u003e\n\u003ctd\u003e980°C – 1000°C \/ 1796°F – 1832°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFlask Temperature\u003c\/th\u003e\n\u003ctd\u003e540°C – 675°C \/ 1004°F – 1247°F (varies by flask size, karat, and jewelry type)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuench Time\u003c\/th\u003e\n\u003ctd\u003e15–25 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePre-alloying with fine gold using aggressive stirring and fluxing is recommended to ensure a uniform mixture.\u003c\/li\u003e\n\u003cli\u003eUse very little boric acid flux. Do not use carbon flux such as soda ash or saltpeter. No flux is needed in a bottom-pour automatic casting unit.\u003c\/li\u003e\n\u003cli\u003eTo calculate the weight of metal needed (in grams), multiply density (g\/cc) by the weight of wax (grams), then add 10% for the button.\u003c\/li\u003e\n\u003cli\u003eAvoid aggressive acids for investment removal — use fluoride-based removers to prevent stress corrosion and surface damage.\u003c\/li\u003e\n\u003cli\u003eRecommended scrap mix: 60% fresh, 40% scrap. Note that white gold alloy has approximately one-third the reusability of yellow gold alloys.\u003c\/li\u003e\n\u003cli\u003eMelt temperature may vary depending on the type of casting unit used.\u003c\/li\u003e\n\u003cli\u003eProprietary metals are present in the formulation and are not fully disclosed in the composition data.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Otto Frei","offers":[{"title":"Default Title","offer_id":44245843247318,"sku":"846-982","price":39.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/ultra-white-9k-18k-stone-in-place-nickel-alloy-otto-frei.jpg?v=1726697575"},{"product_id":"premium-white-9k-18k-silicon-free-casting-master-alloy-per-troy-ounce","title":"Premium White 9-18 Silicon Free Casting Master Alloy-Per Troy Ounce (20DWT)","description":"\u003cp\u003ePremium White 9–18 Silicon Free Casting Master Alloy is a professional-grade white gold master alloy formulated for both casting and fabrication applications. Sold by the troy ounce (20 pennyweights \/ 31.1 grams), this alloy contains no gold and is designed to be pre-alloyed with fine gold to produce white gold alloys from 9K through 18K. The formulation is noted as silicon free in its designation, though the manufacturer notes that proprietary metals, silicon, and deoxidizers may be present in the full composition.\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSuitable for casting and fabrication applications across 9K, 10K, 14K, and 18K white gold\u003c\/li\u003e\n\u003cli\u003ePre-alloying with fine gold is recommended, with aggressive stirring and fluxing to ensure uniform mixture\u003c\/li\u003e\n\u003cli\u003eBoric acid is the recommended flux; carbon fluxes and refining fluxes (soda ash, saltpeter, etc.) should be avoided\u003c\/li\u003e\n\u003cli\u003eAvoid flux in bottom-pour automatic casting units\u003c\/li\u003e\n\u003cli\u003eStandard investment removers are compatible for investment removal; aggressive acids are not recommended due to risk of stress corrosion and surface damage\u003c\/li\u003e\n\u003cli\u003eWhite gold alloy has approximately one-third the reusability of yellow gold alloys; a 70% fresh–30% scrap mix is recommended\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition\u003c\/th\u003e\n\u003ctd\u003eCu 55%, Zn 20%, Ni 25% (plus proprietary metals; may also contain silicon and deoxidizers)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eContains Gold\u003c\/th\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold By\u003c\/th\u003e\n\u003ctd\u003eTroy ounce (20 pennyweights \/ 31.1 grams)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Karat Range\u003c\/th\u003e\n\u003ctd\u003e9K – 18K white gold\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePre-Alloying Temp (10K)\u003c\/th\u003e\n\u003ctd\u003e1100°C – 1120°C \/ 2012°F – 2048°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePre-Alloying Temp (14K–18K)\u003c\/th\u003e\n\u003ctd\u003e1050°C – 1070°C \/ 1922°F – 1958°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCasting Temp (10K)\u003c\/th\u003e\n\u003ctd\u003e1095°C – 1115°C \/ 2003°F – 2039°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCasting Temp (14K)\u003c\/th\u003e\n\u003ctd\u003e995°C – 1015°C \/ 1823°F – 1859°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCasting Temp (18K)\u003c\/th\u003e\n\u003ctd\u003e985°C – 1005°C \/ 1805°F – 1841°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFlask Temperature\u003c\/th\u003e\n\u003ctd\u003e540°C – 675°C \/ 1004°F – 1247°F (varies by flask size, karat, and jewelry type)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuench Time\u003c\/th\u003e\n\u003ctd\u003e20–30 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRecommended Flux\u003c\/th\u003e\n\u003ctd\u003eBoric acid\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cp\u003eMelt temperature may vary depending on the type of casting unit used. Fluxing is extremely important when working with white gold to ensure proper oxide pickup. The composition listed reflects the primary declared metals; proprietary metals and processing aids may also be present. Confirm all technical parameters are appropriate for your specific equipment and application before use.\u003c\/p\u003e","brand":"Otto Frei","offers":[{"title":"Default Title","offer_id":44245843312854,"sku":"846-900","price":8.6,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/premium-white-9-18-silicon-free-casting-master-alloy-per-troy-ounce-20dwt-otto-frei.jpg?v=1726697577"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/collections\/dark-yellow-9-14-investment-casting-master-alloy-for-stone-in-place-casting-per-troy-ounce-20-dwt-otto-frei.jpg?v=1759195219","url":"https:\/\/www.ottofrei.com\/collections\/gold-silver-master-alloys-casting.oembed","provider":"Otto Frei","version":"1.0","type":"link"}