結果 : how to make gold testing acid
6:56

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Dissolving a pure gold bar in acid

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How To Use Gold KT Acid Tester? | JSP Acid testing droplet tutorial.

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1:08

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How to Test Gold Using Gold Testing Acid

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1:01

Testing 14K Gold and Brass using Nitric Acid Demonstrating Solubility of Copper in Nitric Acid! 🐺🔥

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