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<p>[QUOTE=&quot;GDJMSP, post: 726870, member: 112&quot;]Absolutely. Toning and its changes are entirely dependant on storage methods and environment. They can occur gradually over a long period of time, or very quickly over a short period of time.</p><p>&nbsp;</p><p><br /></p><p>&nbsp;</p><p>Not even close to the same results. TPG slabs are in no way airtight nor do they contain anything to inhibit toning. The IS holder does.</p><p><br /></p><p><br /></p><p><br /></p><p>It is very wise to check on them periodically. I would say at the least every 2 to 3 months, if not more. Dramatic changes in toning on coins stored in safety deposit boxes have been documented.</p><p>&nbsp;</p><p><br /></p><p><br /></p><p>I suspect it is a liquid trail left on the coin from the toning process used or in rinsing the same.[/QUOTE]</p><p><br /></p>

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