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<p>[QUOTE=&quot;Leadfoot, post: 1010860, member: 2972&quot;]Cole is right, none of them are airtight.</p><p><br /></p><p>The newer slabs are generally better than the old ones.&nbsp; Airtites are even better.</p><p><br /></p><p>That said, ASE&#039;s are about the MOST reactive coins out there -- you can think of it a numismatic canary in a coal mine -- so if any coin is going to tone in a slab, it&#039;s going to be an ASE.</p><p><br /></p><p>Bottom line:&nbsp; If you want your coins to remain as pristine as possible, limit the temperature change, humidity, and airflow around them.&nbsp; Slabs do a partial job, but the immediate environment around the slabs is just as important.</p><p><br /></p><p>All of the above IMO and based on my own personal experience while recognizing the opinions and experiences of others may vary....Mike[/QUOTE]</p><p><br /></p>

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