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<p>[QUOTE=&quot;Info Sponge, post: 828912, member: 20538&quot;]The best way to settle a scientific question is by experiment, and the easiest experiments are the ones that have already been done for you.</p><p><br /></p><p>Remember those bags of Morgans that sat around for years, and toned in the bag?&nbsp; According to what I read, the ones near the outside of the bag toned, and the ones near the center stayed white.</p><p><br /></p><p>From first principles I would have expected that reactive gases would have spread like ink in water within minutes and reacted over years, meaning that whatever was most reactive with them would suck up the most of them. But if the Morgans in the center were spared, that means there was a filtering effect as the coins toward the outside nailed down contaminants before they could diffuse deeper into the bag.[/QUOTE]</p><p><br /></p>

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