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<p>[QUOTE=&quot;BadThad, post: 1820206, member: 17261&quot;]Copper coins seem to have the ability to pick up and hold black, gummy residues. In chemist speak, these are typically long-chain, organic materials which are readily soluble in a non-polar solvent like xylene. A basic principle in chemistry is &quot;like dissolves like&quot;. You always want to match your conservation solvent with the type of residue you are addressing.</p><p><br /></p><p>NEVER use fingernail polish remover on coins. NEVER! It contains ethyl acetate, acetic acid and other substances that can damage a coin. You need to use 100% acetone which, along with xylene, is available at most hardware stores.[/QUOTE]</p><p><br /></p>

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