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<p>[QUOTE=&quot;GDJMSP, post: 63320, member: 112&quot;]You mention glue in your post - are these Proof sets in original mint packaging ? I ask that because there is no glue in the packaging of modern US Proof sets.</p><p><br /></p><p>Toning can occur in several ways - it can form on the outer edges of the coins and move inwards, it can be somewhat blotchy or the entire coin can tone at about the same time. But in all cases it is due to the same things. All coin planchets are washed before striking - this can have a bearing on the toning. But primarily toning is due to environment - things that the coins come into contact with. In the case of modern Proof sets stored in original packaging this is almost always the air for the packaging is not airtight. For coins that stored individually it can be not only the air, but the air always plays a part, but what the coins are stored in. For example paper envelopes, cardboard 2x2&#039;s or coin albums.[/QUOTE]</p><p><br /></p>

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