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<p>[QUOTE=&quot;ronterry, post: 1300772, member: 28569&quot;]Assuming the slabs are not air tight, than contact with convecting moist warm air carrying sulfur could indeed tone a coin in a slab. (Clad, Silver, and Copper can be toned with the same sulfur rich chemicals)</p><p>Sounds scary, but the fact the slabs have a serial number it could be used to trace the before and after and kill an AT dealer reputation.</p><p>There are currency doctors that are popping classics out of slabs, and doctoring the crap out of them, but I never heard of them returning them to counterfeit slabs using the same card insert? I see it coming though, and that sounds scary!!! </p><p>I&#039;m a fan of embedding the slabs with anti-counterfeit, anti-tampering technology. How about a RFID that dies when it&#039;s exposed to oxygen, and sealed argon or neon filled slabs. Come on PCGS, NGC, PMG, ICG protect our investments! Isn&#039;t that why they get the big bucks?[/QUOTE]</p><p><br /></p>

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