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<p>[QUOTE=&quot;desertgem, post: 3919025, member: 15199&quot;]Polyvinyl chloride itself is not the damaging substance, it is the plasticizers that they add to make a holder very flexible and transparent , some made with a minimum of additives are safe for coins Some put the word &quot;SAFE&quot; in the name. Rigid PVC pipe is mostly just pvc, but it is opaque and safe for coin storage. Many bullion/end of world/&nbsp; people bury all sorts of stuff sealed like plumbing. In my hot (summer) desert environment, Plasticizers gas out within a year or so and the holder will crack if bent. The green/blue gunk is the acidic plasticizer corroding the coin metal.&nbsp; Jim[/QUOTE]</p><p><br /></p>

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