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<p>[QUOTE=&quot;borgovan, post: 524796, member: 13016&quot;]I wouldn&#039;t presume to tell Lehigh what is natural toning and what isn&#039;t, as he&#039;s quite an expert on the matter. </p><p>&nbsp;</p><p>The slabs were not air tight at one point, and I would venture are not air tight at this point. The book &quot;Coin Chemistry&quot; by Weimar White, speak to this issue when he talks about artificially toning coins that are already slabbed. If one subjects a slab to a concentrated sulfur vapor, the gas can seep inside and tone an already slabbed coin. That being said, the experiments were conducted some time ago, and better sealing methods may have been developed by now.</p><p>&nbsp;</p><p>At the MSNS show this past fall, I saw a dealer with ridiculously artifically-toned coins, all modern (like 2004 silver eagles, for instance), all in PCGS slabs. My best guess is that, unless he knows somebody at PCGS, these slabs were gassed.[/QUOTE]</p><p><br /></p>

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