{"product_id":"gold-test-needles-set-5-10k-14k-18k-22k-999-silver","title":"Gold Test Needles-Set Of Five-10K-14K-18K-22K \u0026 .999 Silver","description":"\u003cp\u003eGold test needles are an essential tool for jewelers and precious metal buyers who need to assess the karat or fineness of gold and silver items using acid testing methods. This set of five needles covers the most commonly encountered gold karats and a fine silver standard, giving you reliable reference marks for side-by-side acid comparisons.\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eSet of five test needles covering four gold karats and one silver fineness\u003c\/li\u003e\n  \u003cli\u003eIncludes 10K, 14K, 18K, and 22K gold needles, plus a .999 fine silver needle\u003c\/li\u003e\n  \u003cli\u003eUsed alongside a touchstone and appropriate testing acids for comparative acid reaction testing\u003c\/li\u003e\n  \u003cli\u003eRub or scratch each needle against a test stone, place a mark from the unknown item beside it, apply testing acid, and compare reactions\u003c\/li\u003e\n  \u003cli\u003eIf the unknown item dissolves faster than the reference needle mark, its gold content may be lower karat; if it dissolves slower, it may be higher karat\u003c\/li\u003e\n  \u003cli\u003eSilver needle requires a silver-specific test acid for accurate results\u003c\/li\u003e\n  \u003cli\u003eNote: acid testing with needles is subjective and requires careful observation and practice to master\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003cth\u003eContents\u003c\/th\u003e\n\u003ctd\u003e5 test needles\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eKarats \/ Fineness Included\u003c\/th\u003e\n\u003ctd\u003e10K, 14K, 18K, 22K gold; .999 silver\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eTesting Method\u003c\/th\u003e\n\u003ctd\u003eAcid reaction comparison on touchstone\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eVariant Count\u003c\/th\u003e\n\u003ctd\u003e1 (single set, no selectable options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e10K gold test needle\u003c\/li\u003e\n  \u003cli\u003e14K gold test needle\u003c\/li\u003e\n  \u003cli\u003e18K gold test needle\u003c\/li\u003e\n  \u003cli\u003e22K gold test needle\u003c\/li\u003e\n  \u003cli\u003e.999 fine silver test needle\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cp\u003eAcid testing with test needles is an entirely subjective method and requires careful observation and practice to master. A separate silver test acid is required when testing against the .999 silver needle. This product is subject to California Proposition 65 warnings for Lead and Phthalates.\u003c\/p\u003e","brand":"Otto Frei","offers":[{"title":"Default Title","offer_id":43581743956182,"sku":"156.708","price":77.55,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/gold-test-needles-set-of-five-10k-14k-18k-22k-and-999-silver-otto-frei.jpg?v=1719957416","url":"https:\/\/www.ottofrei.com\/products\/gold-test-needles-set-5-10k-14k-18k-22k-999-silver","provider":"Otto Frei","version":"1.0","type":"link"}