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<p>[QUOTE=&quot;Insider, post: 7684037, member: 24314&quot;]Don&#039;t make this hard.&nbsp; I have no idea of the references you mention but there is a lot of nonsense passed around these days. </p><p><br /></p><p>A lightbulb went off for me when I determined that <b><span style="color: #b30000">a PROPERLY CLEANED coin was one exhibiting NO EVIDENCE OF CLEANING</span></b> while using my stereo microscope at the ANA&#039;s Authentication Service in DC.&nbsp; This definition (<span style="color: #b30000">in red</span>) was used from then on when answering collector&#039;s questions about cleaning.&nbsp; Hopefully, it will be continued to be passed down as is WITHOUT ANY UNNECESSARY MODIFICATION. </p><p><br /></p><p>BTW, in a few cases (before becoming more knowledgeable) we called customers to get their permission to clean the gunk around mint marks on their coin so we could authenticate them.&nbsp; This was done using a stereo microscope.[/QUOTE]</p><p><br /></p>

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