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<p>[QUOTE=&quot;pballer225, post: 1661472, member: 35843&quot;]Sounds like PVC damage, this is not good <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie3" alt=":(" unselectable="on" unselectable="on" /> Some cheaper low quality coin holders are made with some PVC in them, and it releases a gas that is harmful to coins, often turning them green. It also could be verdigris, we&#039;ll have to see some pictures of the coin to help you out more.</p><p><br /></p><p>PS: Any coin will darken or tone over time, but the best way to combat this is to put it in an archival air tight container, such as a slab or an air-tite brand holder. These will only slow the process, however.[/QUOTE]</p><p><br /></p>

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