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<p>[QUOTE=&quot;Gam3rBlake, post: 7928189, member: 115909&quot;]Does anyone happen to know if NGC or PCGS ever use an XRF machine to determine whether a coin is authentic by looking at the metal content?</p><p><br /></p><p>I have seen coin dealers do it before. My local dealer has some fake Peace Dollars someone brought in and when he put it on the XRF machine it said that it was silver plated and to investigate further.</p><p><br /></p><p>Or like for ancient coins if a denarius of Augustus came up as 75% silver 25% copper it would prove it’s fake (or at best an ancient forgery) since denarii of Augustus are always 95% pure or higher (sometimes up to 98%) and didn’t drop to 75% until after Marcus Aurelius which was almost 200 years later.</p><p><br /></p><p>I imagine if TPGs use scales to check the weight as part of the authentication process they might use XRF machines as well but I don’t know for sure.</p><p><br /></p><p>They also seem to have the resources to invest in an XRF machine (or a few of them) especially considering they guarantee their coins so letting a fake slip by could cost them big money.</p><p><br /></p><p>Anyone else know?[/QUOTE]</p><p><br /></p>

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