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<p>[QUOTE=&quot;GDJMSP, post: 1579452, member: 112&quot;]SPP - the reason I am so skeptical about their slabs being watertight is because nobody else&#039;s slabs are watertight. And the reason they are not watertight is because of the sonic sealing process used on them. It is a haphazard process at best and in no way does it completely weld the two halves of the slab together all the way around - it leaves gaps. Small gaps to be sure, but big enough to allow the penetration of water into the slab.</p><p><br /></p><p>There was a time, a few years ago, when NGC experimented with an &quot;airtight&quot; slab. They even advertised it for a while, and charged extra for it. But it quickly went away because it was found to be ineffective and could not live up to the claims.</p><p><br /></p><p>This is found on the NGC web site - </p><p><br /></p><p>[TABLE=&quot;class: infotableFAQ, width: 100%&quot;]</p><p>[TR=&quot;class: question&quot;]</p><p>[TD=&quot;bgcolor: #CCD1E5&quot;]<b>Q.</b> After encapsulation, can the appearance of a coin change over time?</p><p>[/TD]</p><p>[/TR]</p><p>[TR]</p><p>[TD]<b>A.</b> Yes. In independent testing, the NGC security holder has been proven as the most effective grading service holder on the market today in minimizing the effects of oxidation. Even so, the NGC holder is not 100% airtight. Therefore oxidation, a normal process where air reacts with the surface of a coin, can continue after encapsulation. To further limit environmental hazards, we recommend storing your coins in a temperature-controlled, low-humidity area such as a bank safety deposit box. Be sure to check with your bank for rules and regulations concerning the storage of these items.&nbsp; </p><p><br /></p><p>[/TD]</p><p>[/TR]</p><p>[/TABLE][/QUOTE]</p><p><br /></p>

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