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<p>[QUOTE="desertgem, post: 455750, member: 15199"]Since you say it has appeared rapidly, I suggest it might be the oxidation of a thin oil deposit on the surface. It would have been invisible until it oxidized. If the coin can</p><p>be removed from the holder, try some pure acetone on it. If it doesn't dissolve the gunk, it almost has to be copper chunks ( but that would surprise me also as Hobo and Julien said above.</p><p><br /></p><p> When finished rinsing it in the acetone, there should be no streaks, if so, the acetone was a little contaminated, so rinse again with acetone with the coin held vertically. If still there, rinse with distilled water. best of Luck.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>
[QUOTE="desertgem, post: 455750, member: 15199"]Since you say it has appeared rapidly, I suggest it might be the oxidation of a thin oil deposit on the surface. It would have been invisible until it oxidized. If the coin can be removed from the holder, try some pure acetone on it. If it doesn't dissolve the gunk, it almost has to be copper chunks ( but that would surprise me also as Hobo and Julien said above. When finished rinsing it in the acetone, there should be no streaks, if so, the acetone was a little contaminated, so rinse again with acetone with the coin held vertically. If still there, rinse with distilled water. best of Luck. Jim[/QUOTE]
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