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<p>[QUOTE=&quot;-jeffB, post: 1720833, member: 27832&quot;]Good question. Some quick Googling indicates that the bags are made of polyethylene/nylon. Good news: no chlorine; bad news: some nitrogen, and I&#039;m not sure whether it would form anything potentially hazardous during heat-sealing. I&#039;m guessing not, but I don&#039;t have much confidence in the guess.</p><p><br /></p><p>&quot;Vacuuming out the oxygen&quot; sounds great, but most of these materials are quite permeable. They&#039;ll protect food in the freezer for weeks, but I don&#039;t know how much good they&#039;d do for coins over years.</p><p><br /></p><p>I&#039;d still love to have a room full of storage chests that are trickle-flushed with argon... <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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