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<p>[QUOTE=&quot;calcol, post: 2563950, member: 77639&quot;]Vacuum has to be the very best way to store coins.&nbsp; Practically no oxygen, hydrogen sulfide, or water vapor.&nbsp; However, the vacuum has to be monitored.&nbsp; The best setup would be a vacuum chamber with a gauge on it or even better, a pressure alarm.&nbsp; Vacuum pump should be an oil-less type.&nbsp; Problem would be getting a setup for a safety deposit box.</p><p><br /></p><p>It&#039;s possible some slabs might blow apart in a vacuum especially if the chamber were evacuated quickly.&nbsp; Maybe a new crack-out method?</p><p><br /></p><p>I live in a dry climate, so water vapor is not much of a worry.&nbsp; I use Intercept Technology boxes to grab hydrogen sulfide and other metal-reactive gases on their way in toward the coins.&nbsp; The coins are in rigid plastic holders (mostly slabs) rather than paper or cardboard holders.&nbsp; The latter two materials can emit hydrogen sulfide and other nasties.&nbsp; I don&#039;t worry too much about oxygen; it&#039;s not much of a factor in silver or gold toning; not sure about copper.&nbsp; I&#039;ve considered putting the Intercept Tech boxes in a bag and flushing the bag with nitrogen or argon, but am too lazy.</p><p><br /></p><p>Cal[/QUOTE]</p><p><br /></p>

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