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<p>[QUOTE=&quot;Insider, post: 2294027, member: 24314&quot;]Regarding toning of coins in slabs:</p><p>&nbsp;</p><p>It is a fact that some coins will tone (when pretty) deteriorate (when ugly) in slabs.&nbsp; Many of you must have seen an old PCI slab with a label reading:100% White.&nbsp; The major grading services are not immune to this either.&nbsp; A while back (1990s) a chemist subjected slabs from several well-known grading services to an atmosphere of sulfur dioxide and all the coins turned.&nbsp; Holders were different then and I am unaware of any new test results.&nbsp; There is another more devious problem.&nbsp; Many coins are dipped and not neutralized properly before submission to a TPGS.&nbsp; When graded they look bright and original but over time (how long?) they can turn.[/QUOTE]</p><p><br /></p>

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