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<p>[QUOTE=&quot;RonSanderson, post: 24883353, member: 77413&quot;]No. The discussions from a couple of years ago pointed out that the reaction with copper came from just one study, which used some very extreme conditions, and which was not supported by any other research. So, the idea of turning pink is dubious.</p><p><br /></p><p>That said, you may want to look at my post over in <a href="https://www.cointalk.com/threads/post-your-lincolns.192928/page-445#post-24872546" class="internalLink ProxyLink" data-proxy-href="https://www.cointalk.com/threads/post-your-lincolns.192928/page-445#post-24872546">Post Your Lincolns</a>. The removal of a varnish layer (or whatever it was) occurred in stages. The first rinse with distilled water would remove salts and other water soluble compounds. The rinse with acetone will break down any organic buildup. The xylene apparently dissolves a different set of organics.</p><p><br /></p><p>None of the steps will attack metals or minerals that are part of the grunge. If they are just mixed in with some oily crud, they may just drift away when that is dissolved. On the other hand, once the other components of the dirt are removed, these remaining contaminants may remain. As a thin layer on top of the copper, they can cause thin-film color effects.</p><p><br /></p><p>In my post, you can see how a brown gunk can get reduced to bright pinks, blues, and purples.</p><p><br /></p><p>But it is not correct to say that the acetone turned the coin pink. The existing contaminants had already done that - but it could not yet be seen.[/QUOTE]</p><p><br /></p>

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