Precious Metal Test Acids

Scratch testing is one of the oldest methods known to man for testing the karat of gold. In experienced hands, a scratch test is sensitive to within about +/- 1/2 karat or about 2%. In the hands of a novice, sensitivity is more likely to be about +/-1-2 k

This FAST, FUN, ACCURATE, and EASY to use genuine JSP & GTE kit will determine the karat value and purity of Silver Jewelry, scrap, bars, coins, and

JSP Silver Jewelry Acid Test Apprail Kit Detect 999 925 Sterling Solution with Scratch Stone Precious Metals

GTE Gold and Silver Testing Supply

Comparing Gold Testing Methods to Maximize Profits: XRF vs. Acid Scratch vs. Conductivity Testing, Blog Post

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Acid Test – Artisan Antiques

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The Acid Test – Explaining Science