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Spot tests: past and present

Practical Acid Test Kit Silver Platinum Gold Testing Touchstone Jewelry Tool Set Tw

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Practical Professional Gold Tester Acid Kit Silver Platinum Gold Testing Touchstone Gold Detecting Testing Tool Set

GOLD, SILVER, & PLATINUM TESTING KITS – GOLD TESTING EQUIPMENT

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GTE 2''x2'' Small Premium Black Scratch Touchstone for Acid Gold