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What stone and acid do they use for testing gold and silver? ?

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what acid do they use to test silver?gold?what stone?

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  1. The phrase "acid test" refers to nitric acid which does not effect gold, but will dissolve silver and various other metals.

    I cannot recommend rubbing gold, which is quite soft, against any stone to look at the color.  If you want to use your gold to make marks on stones, that is your choice.

    Gold-bug

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