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<p>[QUOTE=&quot;GDJMSP, post: 3156959, member: 112&quot;]It looks pretty obvious to me that somebody has already tried to remove the bezel, or frame as you called it, from the coin and gave up after realizing what was happening. Basically that you&#039;d end up with something worse than it was if left alone.</p><p><br /></p><p>As for this - </p><p><br /></p><p><br /></p><p><br /></p><p>That&#039;s caused by moisture. The moisture causes a chemical reaction to between the two disparate metals to occur. Even excessive humidity can do this. The same kind of chemical reaction can been seen when aluminum comes into contact with copper, and moisture is present. In any event it&#039;s corrosion.</p><p><br /></p><p>To the best of my knowledge acetone will have no effect on it, will not remove it in other words. And I&#039;m not really sure what would remove it as that would depend on exactly what the metal is that is attached to the coin. If it were me, I&#039;d use a toothbrush, carefully, to brush away what you can. Then store the coin properly so as to reduce the moisture as much as possible. You can do that with silica-gel packs and a sealed container.[/QUOTE]</p><p><br /></p>

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