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<p>[QUOTE=&quot;GDJMSP, post: 2207710, member: 112&quot;]Well plastic, even mylar, is air permeable. But I suspect it has more to do with direct contact with the coin being concentrated along a fixed line than it has to do with the object causing the contact (the rubber band). </p><p><br /></p><p>Easy way to find out though. Take a coin in a 2x2 or flip, tie a piece of string or thread around it, let it sit for a month or two. I&#039;m betting the same line will be present.[/QUOTE]</p><p><br /></p>

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