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<p>[QUOTE=&quot;calcol, post: 2988445, member: 77639&quot;]The uncle&#039;s folders were stored in a steel safe.&nbsp; Coins stored in plastic (not PVC) and paper-wrapped rolls in the safe were fine.&nbsp; My coins were stored indoors in a lawyer&#039;s bookcase along with some relatively rare books on ancient coins.&nbsp; Books were fine.&nbsp; We live in a fairly warm, dry climate too.</p><p><br /></p><p>There is no doubt that the folders promoted degradation of the coins.&nbsp; This is particularly true given that the areas of corrosion were the edges and backs.&nbsp; Could be that different batches of folders have had varying amounts of metal-reactive chemicals.&nbsp;&nbsp; Main problem is with copper, copper-plated zinc, and steel coins.&nbsp; Nickel and silver don&#039;t seem to be affected much, not surprisingly.</p><p><br /></p><p>Cal[/QUOTE]</p><p><br /></p>

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