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<p>[QUOTE=&quot;-jeffB, post: 2487249, member: 27832&quot;]I think you&#039;re using &quot;skin&quot; differently from most of the people here -- they use it to refer to toning and surface texture, the stuff that accumulates over time and is destroyed by <i>dipping</i> (in acid or thiourea) or abrasive cleaning. Acetone <i>will not</i> damage THAT &quot;skin&quot;.</p><p><br /></p><p>The kind of &quot;skin&quot; you&#039;re talking about is what I call <i>residue</i> or <i>surface contamination</i>. Most people advise that you <i>should</i> remove that, before it starts to react with the coin&#039;s metal; as I understand it, TPGs can refuse to slab a coin if there&#039;s surface contamination.[/QUOTE]</p><p><br /></p>

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