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<p>[QUOTE=&quot;GDJMSP, post: 3433164, member: 112&quot;]Cardboard and all paper products, and yes this includes cardboard 2x2s, (except those of archival quality) are bad for the same kind of reason that PVC is - it&#039;s because cardboard and paper also put off gasses, only this time the gasses contain large amounts of sulfur. And sulfur will cause the coins to corrode over time and become permanently damaged. </p><p><br /></p><p>Proper coin storage is fairly straightforward, but it&#039;s also complicated at the same time. It&#039;s simple in that only inert materials should ever be used when it comes to proper coin storage. And it&#039;s not direct contact with the coins that you have to worry about - it&#039;s the gasses, the very air, that you have to worry about. This means that nothing but inert materials can be anywhere near your coins ![/QUOTE]</p><p><br /></p>

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