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<p>[QUOTE=&quot;desertgem, post: 3251937, member: 15199&quot;]I think this is the article. But the summary leaves out some important factors. You can ask for the complete article. It was financed by a company that makes chemical solutions that clean copper pipes for soldering. It tended to negate the use of acetone to clean the pipes ( easiest) and promote their solution. I have listed that experiment before, but can&#039;t find it at the moment. Doug and I have posted before on this , and it is my belief that copper coins would never be exposed to the experimental conditions that the experiment was done. But it is normal for people in science to disagree, and Doug has used and been around these chemicals also as have I.</p><p><br /></p><p><br /></p><p><a href="https://www.researchgate.net/publication/229301116_Photochemical_breakdown_of_acetone_on_copper" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.researchgate.net/publication/229301116_Photochemical_breakdown_of_acetone_on_copper" rel="nofollow">https://www.researchgate.net/publication/229301116_Photochemical_breakdown_of_acetone_on_copper</a></p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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