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<p>[QUOTE="borgovan, post: 827713, member: 13016"]If it were my piece, I might use aqua regia (a mixture of nitric and hydrochloric acids.) Neither one individually will dissolve the gold, but in concert, it will. </p><p> </p><p>This solution could harm the silver, but I'll bet a really quick dip (1-2 seconds, then very quickly rinsing under fresh water) would be enough to take the gold off, leaving the coin relatively intact. If the quick dip doesn't do it, you could try progressively longer dips. </p><p> </p><p>You need to be familiar with safety procedures for working with strong acids before attempting this.[/QUOTE]</p><p><br /></p>
[QUOTE="borgovan, post: 827713, member: 13016"]If it were my piece, I might use aqua regia (a mixture of nitric and hydrochloric acids.) Neither one individually will dissolve the gold, but in concert, it will. This solution could harm the silver, but I'll bet a really quick dip (1-2 seconds, then very quickly rinsing under fresh water) would be enough to take the gold off, leaving the coin relatively intact. If the quick dip doesn't do it, you could try progressively longer dips. You need to be familiar with safety procedures for working with strong acids before attempting this.[/QUOTE]
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