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<p>[QUOTE=&quot;desertgem, post: 785011, member: 15199&quot;]Unfortunately the use of the term &quot;cleaned&quot; is not well defined numismatically. Basically, if cleaning can be detected by an experienced grader, it is &quot;improper cleaning&quot;. But cleaning and conservation are not the same in my book. The use of acetone to remove PVC residue is conservation, although perhaps some purists would claim cleaning (as their coin corrodes away) . Probably all of us have felt that a coin was not cleaned , but so noted by a TPG, we can either resubmit it , or accept it as it is. The coin doesn&#039;t change, just our ego relating that we can tell if it is cleaned or not. Traditionally, acid dipping silver coins to make them bright white again has been accepted as OK, as long as it doesn&#039;t disrupt the surface luster noticeably by the experts. If it does, then it is &quot;improperly cleaned&quot;. The terms: cleaning, conservation, artificial toning, natural toning, dipping, darkening, frosting, etc. are all hazy. IMO.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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