The GTE Premium Testing Scratch Stone is an essential tool used to determine the purity and authenticity of gold, silver, and platinum when used with testing acids. This durable touchstone allows you to create a visible metal streak that reacts with testing solutions, helping you quickly evaluate precious metals. Compact, reliable, and easy to use, this testing stone is widely used by jewelers, pawn shops, refiners, and precious metal buyers for everyday metal testing. Product Includes • GTE Premium 2" × 2" Scratch Test Stone• Rubber backing for stable, non-slip desktop testing Testing acids sold separately. How to Use Scratch the item you want to test across the surface of the stone, leaving a visible metal streak about 1 inch long. Apply a drop of testing acid to the streak using the solution that corresponds to the metal you are testing. Observe the reaction and compare the results using your testing chart to determine the metal purity. Ideal For Testing • Gold jewelry• Silver jewelry• Platinum jewelry• Coins and bullion• Scrap precious metals A must-have testing tool for anyone who buys, sells, refines, or collects precious metals.
