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<p>[QUOTE=&quot;desertgem, post: 1283830, member: 15199&quot;]OK, I know as we have been through this discussion several times before, that we have definite opinions. I will accept&nbsp; that you have seen a change occur with copper when acetone was involved. I have used gallons of acetone with no bad effect except for 2 proof wheat cents years ago, which produced white spots, until I used a longer acetone procedure and they disappeared. Meanwhile I probably have saved myself from hundred of cases where a fresh fingerprint could have been on the coin and the acetone removed it before the fingerprint could etch the metal. Same for PVC contamination as the plasticizers are colorless, and only develop the greenish/blue slime when it has actually damaged the metal.&nbsp; So I choose the acetone direction and feel sorry for those who develop PVC, fingerprint, spit, or fly excrement&nbsp; damage because they didn&#039;t use acetone on acquired coins that look OK at the time. If one turns odd because I didn&#039;t notice MS70 oil or such on it, my fault, not the acetone.</p><p><br /></p><p>But I understand why one might not use acetone, and of course it is their coin. I do stand by the statement that pure acetone does not react with copper per se ( not counting such temperature, pressure, or combinations there of, that are not normal for life). To each their own way.</p><p><br /></p><p>Jim&nbsp; <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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