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<p>[QUOTE=&quot;desertgem, post: 1071748, member: 15199&quot;]More than likely, if it is a whitish film or spots that it is beginning toning and obscures the mirror finishes. Acetone will no help that. If it is more greenish, then it might be pvc film from earlier storage days, and if so, acetone can remove that, but there may be damage beneath. Acetone on silver is non-reactive if pure acetone like hardware stores sell, but final rinsing has to be done on a vertically held coin with fresh acetone and held that way until dry. </p><p>&nbsp;</p><p><br /></p><p>On silver proofs, the mirror is so delicate a surface, that any chemical reaction can damage it. </p><p><br /></p><p>Dipping in a thio-acid dip like EZest&nbsp; -could-&nbsp; improve it, but it also could do the opposite.[/QUOTE]</p><p><br /></p>

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