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<p>[QUOTE=&quot;Oldhoopster, post: 8240911, member: 84179&quot;]Slabs are not 100% airtight.&nbsp; They can have variations in the seal, variations in the shells, the plastic isn&#039;t hermetic, etc .&nbsp; if sealed properly, slabs will greatly reduce the exposure to moisture and atmospheric contaminants, but improper long term storage could give you problems.</p><p><br /></p><p>Don&#039;t forget, one of the methods for artificially toning coins in the slab is to pull a vacuum and then introduce H2S or other reactive gas under pressure.&nbsp; This wouldn&#039;t work if slabs were hermetic.[/QUOTE]</p><p><br /></p>

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