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<p>[QUOTE=&quot;Oldhoopster, post: 7638473, member: 84179&quot;]FYI The link is to the Stony Brook Univ. Paper on the possible formation of acetic acid crystals under some very specific conditions (and something you&#039;re not likely to do with your coins unless you&#039;re very negligent).&nbsp; So far, this is the only paper I know of that shows any reaction between copper and acetone. </p><p>BTW: They claim copper acts as a photocatalyst in the formation of acetic acid and not part of the reaction.&nbsp; However, if you were to leave your copper in acetone</p><p>long enough for acetic acid concentrations to get high, it could then react with the copper</p><p><br /></p><p><a href="https://vdocuments.site/photochemical-breakdown-of-acetone-on-copper.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://vdocuments.site/photochemical-breakdown-of-acetone-on-copper.html" rel="nofollow">https://vdocuments.site/photochemical-breakdown-of-acetone-on-copper.html</a>[/QUOTE]</p><p><br /></p>

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