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<p>[QUOTE=&quot;dctuttle, post: 257129, member: 9548&quot;]I have the same issue with my proof sets as well.&nbsp; I think it has to do with the material composition of the holder, which can change from year to year, and the &quot;airtightness&quot; of the holder.&nbsp; I even have proof sets from the same year that tone differently.</p><p>I agree toning is not a bad thing, but on some of my sets spots are developing.&nbsp; I think that is caused by a small piece of paper or some foreign material that gets on the coin when it is encapsuled.</p><p>Dan[/QUOTE]</p><p><br /></p>

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