{"product_id":"10k-gold-testing-acid-solution","title":"10KT Gold Testing Solution-Ships Ground Only","description":"\u003cp\u003eThis small plastic bottle contains approximately one ounce of gold testing acid specially formulated for testing 10K gold. Designed for professional jewelers and metalsmiths, this testing solution helps identify karat content through a controlled acid-reaction process on a test stone. \u003cstrong\u003eShips FedEx or UPS Ground only — no air shipping, no international shipping outside the USA.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eApproximately one ounce of 10K gold testing acid in a small plastic bottle\u003c\/li\u003e\n  \u003cli\u003eFormulated specifically for identifying 10K gold content\u003c\/li\u003e\n  \u003cli\u003eUse with a test stone: scratch or rub the metal onto the stone, then apply the smallest possible drop of acid\u003c\/li\u003e\n  \u003cli\u003eObserve the reaction — metal that dissolves indicates lower karat than the acid; metal that remains indicates a match\u003c\/li\u003e\n  \u003cli\u003eFor more accurate results, compare a known karat sample (test needles or verified gold) alongside the unknown sample\u003c\/li\u003e\n  \u003cli\u003eGlass acid bottles with stoppers allow dragging a drop across two scratches simultaneously for side-by-side comparison\u003c\/li\u003e\n  \u003cli\u003eTesting is skill-based — results develop with experience and repetition\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHazardous material:\u003c\/strong\u003e acid will stain skin and is dangerous to eyes — always wear eye protection and rubber gloves\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eGold Testing Reaction Guide\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eAcid dissolves the metal quickly — metal is likely below the karat indicated on the bottle; try a lower-karat acid\u003c\/li\u003e\n  \u003cli\u003eAcid dissolves the metal slowly — metal may be slightly below the karat of the acid\u003c\/li\u003e\n  \u003cli\u003eMetal remains on the stone — metal is most likely the karat of the acid in the bottle\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSilver Testing Reaction Guide\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e0.999 fine silver turns bright red\u003c\/li\u003e\n  \u003cli\u003e0.925 sterling silver turns dark red\u003c\/li\u003e\n  \u003cli\u003e0.800 silver turns brown\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePlatinum Testing Note\u003c\/h3\u003e\n\u003cp\u003ePlatinum should remain on the stone and not dissolve under platinum acid. Some 800-type platinum alloys may dissolve slightly.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003cth\u003eVolume\u003c\/th\u003e\n\u003ctd\u003eApproximately 1 oz\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eContainer\u003c\/th\u003e\n\u003ctd\u003ePlastic bottle\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eKarat Rating\u003c\/th\u003e\n\u003ctd\u003e10K gold\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eHazardous Material\u003c\/th\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eShipping Restriction\u003c\/th\u003e\n\u003ctd\u003eFedEx or UPS Ground only — no air service, no international shipping outside the USA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eShipping restriction:\u003c\/strong\u003e This item ships via FedEx or UPS Ground only. Air shipping services — including FedEx Priority Overnight, FedEx Standard Overnight, FedEx 2nd Day, UPS Next Day Air, UPS 2nd Day Air, UPS 3-Day, Priority Mail, and Global Express Mail — cannot be selected for this item. Orders requesting air service will be shipped ground. This item cannot ship via USPS. \u003cstrong\u003eCannot ship outside the USA.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eTesting precious metals with acid is subjective, and skill is developed through experience. Always handle acids with care. Wear eye protection and rubber gloves, and use a cloth for cleanup. Avoid skin contact and never allow acid near the eyes.\u003c\/p\u003e","brand":"Otto Frei","offers":[{"title":"Default Title","offer_id":43581627826390,"sku":"156.800","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/10kt-gold-testing-solution-ships-ground-only-otto-frei.jpg?v=1719957487","url":"https:\/\/www.ottofrei.com\/ja\/products\/10k-gold-testing-acid-solution","provider":"Otto Frei","version":"1.0","type":"link"}