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<p>[QUOTE=&quot;Kevo, post: 920912, member: 24781&quot;]What i am saying is that they are not &quot;air tight&quot; to begin with. And neither are the slabs that tpg&#039;s use. Toning is created by certain environmental conditions, regardless of the holder that houses the coin.&nbsp; If you recall a while back, there were some people from certain message boards who had figured out how to tone coins that were slabbed without removing the coin from its holder. Air alone does nothing, you also need moisture, temperature, and time.[/QUOTE]</p><p><br /></p>

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