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<p>[QUOTE=&quot;Conder101, post: 724591, member: 66&quot;]And if you read up on acetone you will find comments that it can react some with copper IF LEFT EXPOSED TO STRONG LIGHT FOR EXTENDED PERIODS.&nbsp; Weeks outside on a picnic table would probably qualify.&nbsp; But there is no reason to do any such thing.&nbsp; I still maintain that when used as a brief cleaning solution to remove organic gunk, the only time I have seen it change the color has been when the copper was already artificially recolored.&nbsp; Sometimes the gunk is also what is causing the color of the coin.&nbsp; Remove the gunk and it looks different.[/QUOTE]</p><p><br /></p>

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