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<p>[QUOTE=&quot;physics-fan3.14, post: 3172826, member: 19165&quot;]Jeff, I don&#039;t know why it happens. But I can say with 100% certainty that I have done the exact same thing as Maxfli. I had one of the 1940&#039;s French colonial coinage that was aluminum (I think this one was from Madagascar). It was bright and lustrous, except for a small bit of PVC on the reverse. I gave it an acetone bath, as I do with all raw coins, and what came out was horribly spotted and ugly over the entirety of both sides. I wish I had taken pictures, but I didn&#039;t.</p><p><br /></p><p>It&#039;s the same pure acetone that I use on everything else. I too was shocked by the result, and have no idea why or how it happened.[/QUOTE]</p><p><br /></p>

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