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<p>[QUOTE=&quot;-jeffB, post: 5258490, member: 27832&quot;]I haven&#039;t tried it, and I won&#039;t. But AGEs have copper alloyed in with the gold, and acids certainly <i>do</i> attack copper.</p><p><br /></p><p>As I understand it, you&#039;re supposed to drag the test item across the stone, then apply acid to the streak. If the acid attacks copper in the alloy, you might not see a visible effect on the streak, but you still might see a visible effect on the coin&#039;s surface.[/QUOTE]</p><p><br /></p>

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