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<p>[QUOTE=&quot;desertgem, post: 7890464, member: 15199&quot;]If the paper itself was processed by the Kraft company ( very common), it was likely made from what was called Sulfite process, which as time goes by can release sulfur gases ( sulfur dioxides )which can react with coin metal , so yes it is possible if the holder is genuine. I have heard of some toning silver coins by holding&nbsp; them over a crucible of smoldering sulfur. </p><p>&nbsp;&nbsp; &nbsp;&nbsp; Since color in toning is dependent on repetitive exposures, leaving a coin in such a holder for years will produce a monotone color , so not very attractive to most. IMO, Jim[/QUOTE]</p><p><br /></p>

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