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<p>[QUOTE=&quot;GDJMSP, post: 903344, member: 112&quot;]Anybody with the money to afford the equipment, or that can pay a lab to do it, has access to this stuff - X-ray spectrometry (EDX), Fournier Transform Infra-Red Spectral analysis (FT-IR), Raman Spectroscopy. But I can&#039;t see any TPG other than PCGS or NGC doing it either. </p><p><br /></p><p>And the use of such machines would absolutely drive the cost of grading up significantly. That&#039;s why only the most expensive coins would ever be submitted to such testing. The one exception might be gold coins that are tested for the presence of putty. That is probably the most prevalent of all the doctoring techniques used. And PCGS has been burned by it many times.</p><p><br /></p><p>When they, PCGS, says - &quot;<i>We have already filed a patent which covers the methodology and unique techniques we are using for processing coins.</i>&quot; - I&#039;m not sure that you <u>can</u> patent methodology and techniques. But I guess time will tell on that.[/QUOTE]</p><p><br /></p>

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