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<p>[QUOTE=&quot;GDJMSP, post: 2118755, member: 112&quot;]No, not mine anyway. The important thing is the forced contact between the coin and mylar. Many plastics have a way of attracting things right out of the air. I&#039;ve always attributed it to static electricity, but I can&#039;t swear to it that is the reason. I am only aware of it because of observation. For example, a plastic trash can or a laundry basket, if placed very close to a wall and left there over a long period of time will cause a dark mark on the wall because the plastic attracts particles out of the air and they stick to the wall concentrated in that location. I have 3 or 4 places in my own place where this happened.</p><p><br /></p><p>The rubber band across the mylar, is a similar kind of thing. Contaminants in the air are attracted to the mylar, (and maybe the rubber band too for that matter), and are deposited and concentrated where it touches the coin.[/QUOTE]</p><p><br /></p>

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