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<p>[QUOTE=&quot;Oldhoopster, post: 2838120, member: 84179&quot;]It&#039;s not quite so simple.&nbsp; Some cleaning is bad and some cleaning is OK</p><p><br /></p><p>In very general terms, Removing toning by dipping in a chemical solution like thiourea or an abrasive method is generally considered bad and will reduce the value of a coin.&nbsp; Since this type of cleaning removes some surface metal, it&#039;s usually apparent when looking at a coin, especially if done by someone at home (if dipped by an expert, you may need to be an expert to see it). </p><p><br /></p><p>Distilled water, acetone, or Xylene does not react with the toning on the coin.&nbsp; It only removes the &quot;gunk&quot; that may have accumulated on the surface (assuming the gunk is soluble in these liquids).&nbsp; Since it doesn&#039;t react with the metal, it is generally not noticeable (but you may see differences in the natural toning caused by the specific areas not being exposed to the same atmospheric conditions as the rest of the coin)</p><p><br /></p><p>Hope that helps.[/QUOTE]</p><p><br /></p>

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