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<p>[QUOTE=&quot;desertgem, post: 4664517, member: 15199&quot;]If a person takes it out of acetone and then let it air dry, a color may well appear as the impurities the acetone removed attaches&nbsp; right back on the coins surfaces as a thin film of &#039;whatever&#039; refracting the light as it can&#039;t carry the impurities away like it can water molecules. I would put any coin made of mint metals in it all day if it is in a normal conditions and not a high moisture,high heat ,high UV radiation lab experiment as the &quot;one&quot; people mention. They were working for a solvent company trying to show the product was better than acetone for cleaning copper tubing and fixtures before soldering. I could find no evidence it was peer reviewed beyond their publication. IMO, Jim[/QUOTE]</p><p><br /></p>

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