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

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

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

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This EASY to use genuine GTE white 2”x2” test stone is a useful tool to use with testing acids when determining the karat value and purity of Gold,

GTE *White* 2''x2'' Testing Touchstone Streak Stone for Gold Silver Jewelry Precious Metal Sterling Acid Solutions 10K 14K 18K 22K .999 24K

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