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<p>[QUOTE=&quot;Oldhoopster, post: 3251962, member: 84179&quot;]I agree with your comments.&nbsp; Generally, I would conclude that the user left some residual organic material or didn&#039;t rinse the residue off the coin.&nbsp; However, Doug is experienced in this area, which makes it all the more interesting.&nbsp; I am still waiting for the science to explain what is happening.</p><p><br /></p><p>Here is a more detailed abstract of the Stony Brook paper, along with the abstract to a follow up paper (which is not applicable to numismatics).&nbsp; Once again, I can&#039;t see how the acetone reacts with copper during the normal usage in removing organic substances from coins (shorter soaks, thorough rinsing, not letting the acetone evaporate after prolonged soaks).</p><p><br /></p><p><a href="https://www.stonybrook.edu/vescalab/research/research7.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.stonybrook.edu/vescalab/research/research7.html" rel="nofollow">https://www.stonybrook.edu/vescalab/research/research7.html</a></p><p><br /></p><p><a href="http://jes.ecsdl.org/content/147/11/4125.abstract" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://jes.ecsdl.org/content/147/11/4125.abstract" rel="nofollow">http://jes.ecsdl.org/content/147/11/4125.abstract</a>[/QUOTE]</p><p><br /></p>

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