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<p>[QUOTE=&quot;-jeffB, post: 1390498, member: 27832&quot;]Like I said, I don&#039;t know enough to dismiss the claims out of hand, but I am a little puzzled that they aren&#039;t more widely cited. All the abstracts and summaries include the bit about &quot;use of acetone for degreasing copper and copper containing alloys as recommended by ASTM E1078-97&quot;. If this is really a widely-applied standard for cleaning copper, and this researcher really has shown that it can result in significant corrosion, why in the last 12 years hasn&#039;t it been more widely discussed?</p><p><br /></p><p>Sometimes it does take a long time for legitimate discoveries to be widely accepted (see, for example, <a href="http://en.wikipedia.org/wiki/Helicobacter_pylori#History" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://en.wikipedia.org/wiki/Helicobacter_pylori#History" rel="nofollow">Helicobacter pylori</a> and ulcers). But sometimes, claims are just wrong.</p><p><br /></p><p>Of course, even if this particular claim is completely baseless, it doesn&#039;t prove that acetone <i>is</i> safe for copper coins.</p><p><br /></p><p>Maybe next weekend I&#039;ll run an experiment or two. Should be easy enough to set up the light-vs.-dark comparison, put a microscope on the light-vs.-dark coins, and maybe even stick some litmus paper in the light-vs.-dark acetone.[/QUOTE]</p><p><br /></p>

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