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<p>[QUOTE=&quot;Insider, post: 2487292, member: 24314&quot;]A drop of acetone will not ruin the coin.&nbsp; It may change the color of the surface.&nbsp; A professional conservator would put your coin under a microscope and might remove some of the black without leaving any traces of his work behind.&nbsp; The key is SPOT conservation so that none of the surrounding surface is affected. This is not something to be tried without florescent light, a stereo microscope, a quiet room, and EXPERIENCE!&nbsp; As I wrote before, you will still have an impaired surface with the best conservation so IMO, leave it alone.&nbsp; As it is, you have a minor mint error on a very attractive coin.[/QUOTE]</p><p><br /></p>

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