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<p>[QUOTE=&quot;desertgem, post: 3034500, member: 15199&quot;]For pH to have an effect on the coins, there has to be enough moisture for the aluminum sulfate that is used at various concentrations ( close to zero for archival paper) to be in solution to react on the coin metal. The Alum doesn&#039;t dissipate from the paper, so moisture becomes the determining factor. I have seen the cheaper coin books falling apart and the coins ruined, but have also seen and have various brand cardboard coin books, that the coins have aged appropriately for the environment without any visible acidic effects. Since I live in a low humidity environment, I do not notice any acidic effect. Others ( such as in Florida, and gulf coast) may have them horrendously apparent. The rims are the area of the coins that usually darken first. If you live in a high humidity area, I do not think any specific brand of book will be much better than another due to the ability of moisture to get into the paper. If one can deal with the books being put into ziplock type food bags with sacrificial copper coat cents ( zincolns) I believe that to be an excellent long term storage. IMO, Jim[/QUOTE]</p><p><br /></p>

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