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<p>[QUOTE=&quot;Collect89, post: 1639849, member: 15445&quot;]There is a well known book called Coin Chemistry by Weimar White.&nbsp; I don’t own the book but I have read a friend’s copy.&nbsp; (It was a short read as I recall).&nbsp; I believe that there is an example provided in the book where a coin is toned inside its slab.&nbsp; Sorry, I don’t have the book to confirm this.&nbsp; Perhaps someone with the book would chime-in.</p><p><br /></p><p>BTW, most slabs are not air tight.&nbsp; Also, I believe that there have been slabs that included materials inside the slab that caused toning affects.&nbsp; I give no fault to the slab companies that used the materials because they were just as surprised as the coin owners.[/QUOTE]</p><p><br /></p>

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