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<p>[QUOTE=&quot;GDJMSP, post: 2804360, member: 112&quot;]Ehhh, kinda sorta but not really. The first I ran across these reports was on the NGC forum almost 20 years ago in posts made by highly respected members. People who know coins and who had personally had copper coins turn weird colors after using acetone on them. And not on all copper coins but on some of them. </p><p><br /></p><p>After that I started doing tests myself and sure enough it happened often enough to be a concern. That&#039;s when I started posting about using acetone on copper not always being a good idea. </p><p><br /></p><p>And the company you&#039;re talking about, I&#039;m the one who dug up that scientific article and posted a link to it here for the first time.</p><p><br /></p><p>So no, it&#039;s not rumors, it does happen. Not always, but it happens. And I&#039;m not the only one who has seen it happen.[/QUOTE]</p><p><br /></p>

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