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<p>[QUOTE=&quot;Atarian, post: 1540126, member: 34285&quot;]Has anyone here ever tested just how &#039;sealed&#039; a coin in a PCGS or NGC slab is? I know they are &#039;sonically sealed&#039; but can find no information on their web sites as to how this is done, so I have to guess based upon the term that sound waves are somehow heating the plastic and fusing the halves together?</p><p><br /></p><p>So this makes them somewhat airtight, it would seem. One of the selling points is the protection the slab provides, yet they also state to store them in a cool dry area, just as most people would store any other coin (excluding pocket change of course).</p><p><br /></p><p>Anyone tested a slabbed coin by submerging it in water for a few days and see what happens?</p><p><br /></p><p>I&#039;m just bored and curious here.</p><p><br /></p><p>Thanks.[/QUOTE]</p><p><br /></p>

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