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<p>[QUOTE=&quot;desertgem, post: 1188885, member: 15199&quot;]Most likely, there is a &quot;leak&quot; in the seal, check around the seal where the toning is most evident. Usually you will find either a very small puncture or separation. The plastic is to protect the surface from abrasion, not necessarily air. This occasionally occurs on almost every type of mint seal, including foreign. But notice it took 23 years for enough air to get in to cause the toning. This small amount of air being sealed with a coin in this type of holder, if intact, can not, IMO and chemical knowledge, carry enough contaminant molecules to cause that amount of toning.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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