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<p>[QUOTE=&quot;coinhead63, post: 1046829, member: 28001&quot;]Rich,</p><p>From what I gather, you have established storage practices that have been working for a long time.&nbsp; Like the old saying goes:&nbsp; &quot;If it ain&#039;t broke, don&#039;t fix it!&quot;.&nbsp; However, the new storage devices are designed to provide even more protection against harmful environments.&nbsp; Most manmade materials give off gasses that are harmful to coins.&nbsp; Some are corrosive like PVC and transfer a &quot;slime&quot; that will eventually damage a coin if left alone for a period of time.&nbsp; Additionally some natural fibers are corrosive including certain types of wood such as oak which contains tannic acid.&nbsp; If you have any coins, especially silver, in old Whitman blue folders, pop a few out and look at the back side.&nbsp; If they&#039;ve been in there any length of time you will notice they have &quot;toned&quot; or tarnished.&nbsp; Sometimes you get lucky and have a nice toning and other times you get an ugly brown tarnish.&nbsp; It is due to the acid that remained in the paper from turning wood fibers into wood pulp and any bleaching/dyeing process that was done to finish the paper.</p><p>&nbsp;</p><p>Archival storage for paintings, cloth, photos, etc. has been a key issue for museums for decades.&nbsp; The Smithsonian and the National Coin Cabinet have placed coins in plastic &quot;slabs&quot;.&nbsp; Humidity, oxidation and pH are controlled by encapsulation.</p><p>&nbsp;</p><p>The bottom line is to be careful of what you seal your coins in.&nbsp; You may be trying to keep out moisture, etc. but may have inadvertantly sealed them in a chemical prison only to die a slow and ugly death.[/QUOTE]</p><p><br /></p>

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