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<p>[QUOTE=&quot;illini420, post: 1116548, member: 19423&quot;]They most certainly are NOT air/water tight.&nbsp; I would think that if the slabs were 100% sealed off, most likely you&#039;d see some condensation on the inside of the plastic when the temp changed rapidly, which would be very bad.&nbsp; So if you live in a humid area, your coins aren&#039;t protected just by having them in slabs.&nbsp; You should keep them in a humidity controlled area and keep plenty of fresh dessicants nearby to take the humidity out of the air.&nbsp; But yeah, definitely don&#039;t try storing them in the fish tank![/QUOTE]</p><p><br /></p>

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