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<p>[QUOTE=&quot;19Lyds, post: 2562699, member: 15929&quot;]IMO, no.</p><p><br /></p><p>Toning requires oxygen and other gases which are, by design, minimalized in a 3rd party slab.</p><p><br /></p><p>No, 3rd Party Slabs are not &quot;Air Tight&quot; nor are they &quot;Water Proof&quot; BUT there is not a ready &quot;flow&quot; of air within a slab as the flow, if any at all, would be the result of pressure changes and as such, extremely minimal.</p><p><br /></p><p>Even outside a 3rd party slab, the coins in question, the Battlecreek coins, have been removed from the environment which caused them to tone so, it only stands to reason that any subsequent toning would be minimal at best.</p><p><br /></p><p>A coin which has turned completely black due to toning is simply a coin which was left in it&#039;s &quot;artificial toning environment&quot; too long.</p><p><br /></p><p>Any attempts at &quot;halting&quot; a natural toning process aside from removing the coins from the toning environment would be futile guesstimates IMO.[/QUOTE]</p><p><br /></p>

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