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<p>[QUOTE=&quot;desertgem, post: 4195657, member: 15199&quot;]Water vapor is of course one thing to avoid and the second is chemicals that can activate corrosion of the coin metal. Desiccators are important, as long as they are exchanged or regenerated regularly. If they hold excess of water , they become a contributor. I am very suspicious of any wood , varnish, or cloth like material, especially deeply colored ones. I realize they are traditional, but the wood itself, stains, finishes, felts,plant fibers, cloth coloring, can all have chemical reactions with metals. So I would be sure that good info on those would be available and not just seller assurance.</p><p>&nbsp;</p><p><br /></p><p>&nbsp;&nbsp; Inert plastic containers ( non-PVC or similar) will physically protect the coins but are slightly permeable ( Including TPGers such as PCGS, NCG, etc. ) so sacrificial metals can be provided.</p><p>&nbsp;&nbsp; &nbsp; I take a bunch of disposable coins such as new 2019 cents and scratch the surface up and put them into any storage device I use for &#039;good coins&#039; ( usually zip lock bags for food storage and seal them and put that into another zip lock bags holding about 10 more of the scratched up bright shiny cents&nbsp; and seal it. When those 10 coins start to turn brownish, open the bag and replace them and the outer bag and reseal.If the inner bag coins also show change, change them and the bag also If you live in a moist environment , you can add a desiccator to the outer bag.</p><p><br /></p><p>&nbsp;&nbsp; If a person want the coins on display at all times, to show or hold, it becomes a different game. Ancient coins have usually developed a protective patina over the years in drier areas, by may have developed corrosion from natural water sources. You can find more expert info on their preservation in the ANCIENT COIN forum, but basically metal is metal.&nbsp; &nbsp; </p><p>IMO, Jim[/QUOTE]</p><p><br /></p>

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