This 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. Ships FedEx or UPS Ground only — no air shipping, no international shipping outside the USA. Features Approximately one ounce of 10K gold testing acid in a small plastic bottle Formulated specifically for identifying 10K gold content Use with a test stone: scratch or rub the metal onto the stone, then apply the smallest possible drop of acid Observe the reaction — metal that dissolves indicates lower karat than the acid; metal that remains indicates a match For more accurate results, compare a known karat sample (test needles or verified gold) alongside the unknown sample Glass acid bottles with stoppers allow dragging a drop across two scratches simultaneously for side-by-side comparison Testing is skill-based — results develop with experience and repetition Hazardous material: acid will stain skin and is dangerous to eyes — always wear eye protection and rubber gloves Gold Testing Reaction Guide Acid dissolves the metal quickly — metal is likely below the karat indicated on the bottle; try a lower-karat acid Acid dissolves the metal slowly — metal may be slightly below the karat of the acid Metal remains on the stone — metal is most likely the karat of the acid in the bottle Silver Testing Reaction Guide 0.999 fine silver turns bright red 0.925 sterling silver turns dark red 0.800 silver turns brown Platinum Testing Note Platinum should remain on the stone and not dissolve under platinum acid. Some 800-type platinum alloys may dissolve slightly. Specifications Volume Approximately 1 oz Container Plastic bottle Karat Rating 10K gold Hazardous Material Yes Shipping Restriction FedEx or UPS Ground only — no air service, no international shipping outside the USA Notes Shipping restriction: 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. Cannot ship outside the USA. Testing 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.
