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<p>[QUOTE=&quot;GDJMSP, post: 2658133, member: 112&quot;]I readily acknowledged in my previous posts that there are more than a few coins in major TPG slabs that have foreign substances on them that were intentionally applied to them, for shall we say, nefarious purposes. In other words, to hopefully cause the coin to get a higher grade than it otherwise would have had that substance not been applied to the coin.</p><p><br /></p><p>But, in the vast majority of those cases I believe those coins were slabbed and cleanly graded because that foreign substance was undetected by the TPG at the time the coin was graded. In other words the TPGs were fooled by coin doctors. So personally, I find no fault with the TPGs regarding this. And in their defense, when something like this happens they back it up with their guarantee, most of the time anyway.</p><p><br /></p><p>That said, &quot;could&quot; those foreign substances have been detected by the TPGs ? Without a doubt, yes they could have. But only if the TPG had run the required testing procedures to do so. And THAT is the part that is not practical. So if that is what you are referring to, we are in agreement. Now you know why and I know why it is not practical, but I suspect many others don&#039;t. So&nbsp; &nbsp; ........</p><p><br /></p><p>The reason it is not practical is because of two things, the time element and the expense. If every coin were tested for foreign substances the turn around times for grading that most already find way too long would increase significantly, perhaps doubling or even tripling. And the cost for grading would also increase about the same I suspect. Those two things combined would pretty much put an end to the industry.</p><p><br /></p><p><br /></p><p>edit - As for your comments about the &quot;possible legal problem&quot; with - you&#039;d said conserving I&#039;ll saying cleaning but it&#039;s the same thing - all coins prior to grading; yeah I agree that would be a problem and not a good idea. However, if the owners of the coins agreed to it beforehand, then no problem would be involved. But that brings us right back to the reason it&#039;s not practical.</p><p><br /></p><p>I would also mention that there was a time, long ago, when NGC and PCGS actually tried that scenario of cleaning coins before grading. And this is documented - </p><p><br /></p><p><i>PCGS and NGC Dipping Coins</i></p><p><i><br /></i></p><p><i>The Professional Coin Grading Service and the Numismatic Guaranty Corporation have confirmed that they have been dipping coins upon request. The coins are not marked on the slab as cleaned.</i></p><p><i><br /></i></p><p><i>References: Numismatic News, 8 Aug 1995, p. 1; Coin World, 18 Sep 1995,</i></p><p><i>&nbsp;p. 1, 7.</i>[/QUOTE]</p><p><br /></p>

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