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<p>[QUOTE=&quot;GDJMSP, post: 14837953, member: 112&quot;]Their most common use is to detect small traces of putty that is used on coins to fill in scratches, contact marks, dings, gouges, etc etc in order to get the coin to grade higher than it deserves to be braded. When putty is used properly by somebody who knows what they are doing, even the professional graders at the TPGs cannot see the putty with the naked eye or a loupe. So many puttied coins were being given clean grades, and higher grades - when they didn&#039;t deserve either one. All puttied coins are supposed to be labeled as problem coins and put inti Detail slabs.</p><p><br /></p><p>And putty is not the only thing being used on a coin that makes a coin a problem coin of course, there are kinds of things, foreign materials, that make a coin a problem coin. And the video that PCGS had available on their website for years and years, showed a short version of the list of materials what would make a coin a problem coin. Things like putty, PVC residue, any kind of oil, lacquer, varnishes, even many commercial products that leave behind what is advertised as a &quot;protective coating&quot; on the coin - all of those things make a coin a problem coin that can never be given a clean grade.</p><p><br /></p><p>But chemicals that are used to clean coins properly, things like commercial coin dips, acetone, xylene, the sniffer doesn&#039;t and can&#039;t detect those because there&#039;s nothing to detect. That&#039;s because those chemicals do not leave any traces behind on the coin. </p><p><br /></p><p>And of course it has to be noted that ONLY the coins submitted under the special and secure grading tiers (where you pay extra) are run through the sniffer. Coins submitted under all other grading tiers are NOT run through the sniffer ! Put another way, the vast, vast majority of all coins submitted to the TPGs are never run through the sniffer ![/QUOTE]</p><p><br /></p>

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