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<p>[QUOTE=&quot;GDJMSP, post: 8593910, member: 112&quot;]Yes, aluminum foil is not air permeable like paper and most plastics. As Thad explained, some the sulfurous gas being put off by the paper roll could still escape through the seams of the foil, but for the most part it would trapped inside the foil thus being concentrated around the coins.</p><p><br /></p><p>Another of looking at it would be that by wrapping the foil around the outside of a paper roll you have done the exact opposite of what one would be hoping to do by wrapping the foil around the coins inside the paper roll. The very purpose of the foil being inside the roll is to prevent the harmful gasses from the paper roll, as well as outside air, getting to the coins and causing corrosion/toning.</p><p><br /></p><p>That&#039;s why the foil idea worked (as long as there was no moisture). It prevented all that from happening.[/QUOTE]</p><p><br /></p>

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