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<p>[QUOTE=&quot;NPCoin, post: 3253601, member: 5629&quot;]I know it is only the abstract, but I believe that should be enough to understand the gist of the paper (as well as its application to this discussion).&nbsp; The abstract reveals three things needed to produce a reaction on the copper:</p><ol> <li>presence of acetone on the copper</li> <li>presence of ambient light</li> <li>presence of water vapor (humidity)</li> </ol><p>The resulting reaction is the slow formation of acetic acid.&nbsp; This is also present in vinegar.&nbsp; I&#039;ll let you springboard your thoughts from there (especially if you&#039;ve ever experimented with copper and vinegar before).</p><p><br /></p><p>Now, we know that:</p><ol> <li>humidity and light both help to accelerate oxidation</li> <li>acetic acid is an oxidizing agent</li> <li>copper reacts through oxidation to create copper oxide</li> <li>copper oxide is evidenced on copper through a change in the surface color</li> </ol><p>When using acetone, it has been said, sometimes there is no adverse effect on the copper coin, but sometimes there is questionable color.</p><p><br /></p><p>We are able to deduce from what we know that this &quot;sometimes&quot; occurrence most likely happens because the acetone had not been properly rinsed from the coin and the coin had been subsequently left in a well-lit, humid environment which facilitates the rapid conversion of the acetone to <span style="color: #b30000">acetic</span> acids, thus facilitating the oxidation of the copper to copper oxide resulting in the questionable coloring of some copper coins treated with acetone.</p><p><br /></p><p>If one wants to prove such a thesis, then one is more than welcome to experiment at one&#039;s own leisure.</p><p><br /></p><p><br /></p><p>edit:&nbsp; changed &quot;amino&quot; to &quot;acetic&quot; (in red), sorry for the confusion[/QUOTE]</p><p><br /></p>

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