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<p>[QUOTE=&quot;GDJMSP, post: 158724, member: 112&quot;]Not a clue what it is. But if all the coins have stuff like that on them a dip in acetone certainly isn&#039;t going to hurt them any worse It&#039;ll make them change colors though.</p><p><br /></p><p>You might want to try distilled water first - see if it will dissolve whatever that stuff is. That won&#039;t make them change colors.</p><p><br /></p><p>By the way Dot, based on the pic those coins are not BU - even without the gunk.[/QUOTE]</p><p><br /></p>

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