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<p>[QUOTE=&quot;Theodosius, post: 2747569, member: 77077&quot;]Unless people are smearing wet concrete on coins, I would be inclined to agree.&nbsp; Not sure what adhesive based mixture you could apply that a strong, organic solvent like acetone would not remove. I have heard of people mixing dust and superglue to smear on, but acetone should remove that as well.</p><p><br /></p><p>Metal based corrosion deposits (that could be ancient) would not dissolve in an organic solvent. There could have been a base of natural adhesions that got covered in colored goop.[/QUOTE]</p><p><br /></p>

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