Bench Tip #9: Use the Touchstone Method for Testing Purity in Karat Gold

This article explains how to use the touchstone method for testing purity in karat gold.

GTE 2''x2'' Small Premium Black Scratch Touchstone for Acid Gold Silve – GOLD TESTING EQUIPMENT

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Refining Precious Metal Wastes C M Hoke, PDF, Platinum

Tips from the Bench

Episode 1- Acid Test

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Refining Precious Metal Wastes C M Hoke, PDF, Platinum

How to Tell If Gold Jewelry Is Pure 24 Karats

1PC Professional High Purity Graphite Stone Practical Acid Silver Platinum Gold Testing Touchstone Jewelry Tools For Jeweler - AliExpress