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<p>[QUOTE=&quot;-jeffB, post: 4101234, member: 27832&quot;]I&#039;m not sure we can answer that. It depends a lot on how they&#039;re stored, especially temperature and humidity. If you&#039;re lucky, they can go decades without a problem; if you&#039;re unlucky, they can get corroded in weeks or months.</p><p><br /></p><p>If you can get good, clear, in-focus pictures of some of the coins, we might be able to give you a better idea.</p><p><br /></p><p>I have an example of a modern quarter that I posted here a few years ago -- it was toned in a rainbow of colors. I left it in my office on an anti-static work mat, which apparently is made of PVC. When I came across it a few weeks ago, I picked it up, and found that it had stuck to the mat; there was a green circle where it had been, and the coin&#039;s reverse was sticky and corroded. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie3" alt=":(" unselectable="on" unselectable="on" /> When I have time, I&#039;ll post before-and-after images.[/QUOTE]</p><p><br /></p>

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