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<p>[QUOTE=&quot;frech001, post: 2165388, member: 20616&quot;]I had the experience in the past of going through several thousand coins that were improperly stored in a damp basement and a barn.&nbsp; Those in sealed plastic coin holders and tubes were OK even under these harsh conditions.&nbsp; The 2x2 cardboard flips turned to dust as humidity, direct moisture and mold rotted them away, but in many cases the coins within the mylar or acetate were OK.&nbsp; Coins in open holed cardboard folders did not fare well.&nbsp; Coins in cardboard folders with plastic sleeves on both sides did better.&nbsp; Silver coins darken but don&#039;t corrode easily, pure coppers and some bronze were mixed.&nbsp; Aluminum was the worst, in some cases turning to powder.&nbsp; Iron and zinc fared poorly.&nbsp; Copper/nickel, brass, aluminum/brass and some other alloys were mixed as well.&nbsp; Stainless steel was the most resistant.&nbsp; I don&#039;t have any experience with gold but I know that there are many alloys of gold.&nbsp; In addition to the threats noted in the excellent previous post is the combination of rapidly changing temperature and humidity.&nbsp; Coins will stay cooler when the temperature rises quickly and attract moisture.&nbsp; So storing them in rubber gasketed steel ammunition boxes or tupperware with desiccant as noted above, prevents rapid influx of moist air.&nbsp; If your coins are valuable, they should also be stored in a bank deposit box.[/QUOTE]</p><p><br /></p>

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