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Simply letting the vinegar touch your gold piece is enough to test it. 4. Let the vinegar sit for 15 minutes. The acid in the vinegar takes a couple of minutes to react with gold and other substances. Keep the vinegar sitting on your gold piece for at least 15 minutes, ...

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One of the most valuable metals on Earth, gold was valued even above currency in ancient times. Gold is malleable and ductile with high electrical conductivity and resistance to oxidation. Gold's melting point is also very high, at 1,945 degrees F. Gold can be stretched and hammered into sheets or strings very easily without breaking, and can be 10 times as thin as …

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Visual inspection: Pure gold dust typically has a bright yellow color. Variations might indicate the presence of other metals. Magnet test: Gold is not magnetic. If your gold dust is attracted to a strong magnet, it likely contains other metals. Acid test: Use a gold testing kit with different strengths of nitric acid.

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