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<p>[QUOTE=&quot;baseball21, post: 2851916, member: 76863&quot;]Neither PCGS or NGC will disclose exactly what they&#039;re made of but on the PCGS website it says theirs is a proprietary polymer formula tested to be 99.99% chemically-inert.&nbsp; The modern NGC ones are pretty inert as well.&nbsp; The major companies have been pretty good with having inert material for quite some time, the ones that do cause toning was more than likely a label and/or ink issue.&nbsp; Even with those they toned some coins a lot, some a little, and some didn&#039;t tone at all.&nbsp; I guess theoretically it should have been more even but in practice it really just seems like some coins will tone and others just really won&#039;t.[/QUOTE]</p><p><br /></p>

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