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<p>[QUOTE=&quot;lkeigwin, post: 1190528, member: 30400&quot;]It looks fine to me. I don&#039;t see any evidence of cleaning. But the TPG&#039;s surprise us all the time. As a rule, I am at least a little suspicious about any valuable, scarce coin that is not in a respected TPG holder.</p><p><br /></p><p>PCGS&#039;s Sniffer is routinely used on Secure Plus submissions, and only &quot;as needed&quot; on all other grading services. It detects specific substances/chemicals on the coin&#039;s surface.</p><p><br /></p><p>The Sniffer may occasionally help PCGS wth an AT/NT call but its primary purpose is to weed out doctoring to enhance a coin&#039;s appearance or conceal flaws and weaknesses. So it sniffs for putty, skin oils, certain coin solutions, etc. The list of substances it detects is public (and a little gross).</p><p><br /></p><p>Whether a coin is AT or NT is generally decided by the graders based on its appearance, the toning pattern and color progression, etc.</p><p>Lance.[/QUOTE]</p><p><br /></p>

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