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<p>[QUOTE=&quot;desertgem, post: 1948740, member: 15199&quot;]You might try using a &#039;vacuum storage bag&#039; and vacuum the enclosed air out of the slabs and then visit a welder and blow argon into the bag and seal. Then the inside of the slab would be argon purged and in inert gas. Sealing a slab even in a clean room wouldn&#039;t be permanent as atmospheric pressure change will act like a bellows to suck in and blow out over time. Any smoking or cooking vapors from a room can be bad for coins. And except for dense slabs, metal, etc. diffusion can occur anyway, and metal slabs are hard to see through.&nbsp; </p><p><br /></p><p>I seem to recall that some depository sealed some moon rocks material in a safe that had argon supplied for a positive pressure and little contamination. If you have an extra safe and welding skills, it seems one could build one rather easily, although I&#039;ll take my chances with the supplied slabs <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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