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<p>[QUOTE=&quot;desertgem, post: 1679586, member: 15199&quot;]The film type government package, as well as any cardboard or paper used, was intended for transport and not for long term storage. The materials were not close to air tight, and most were porous to reacting chemicals in the air or paper around them. Many proof sets were collected still in their ordinary paper envelopes which generally had a high sulfur content. The film material <b>did not react</b> , but did allow reacting substances to pass through, a possible source of any spotting of the coins.</p><p><br /></p><p><br /></p><p><br /></p><p>For areas of the country that are usually dry and not in high industrialized, chemically laden air, the coins would have the possibility of high unspotted survival, and those are probably the coins you see slabbed. &quot;Cleaning&quot; a proof coin of damage and not having it visible ( sooner or later) again is extremely difficult IMO, and would have to be done carefully.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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