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<p>[QUOTE=&quot;GDJMSP, post: 1520348, member: 112&quot;]We&#039;ll see what Thad says. But, I think it is important to understand that the edges of slabs are not completely sealed together all the way around, there are gaps. Also, the plastic itself is air permeable. That means that air can go right through the face of it.</p><p><br /></p><p>That said, permeation happens very, very, slowly, but it does happen. I can&#039;t even begin to estimate the time frame.</p><p><br /></p><p>As for the air going through the gaps in the slab joint, that happens continuously. And it occurs much faster when the barometric pressure changes. The tiny bit of air inside the slab is always trying to equalize with the air outside the slab. That is part of the reason why the step (of proper coin storage) of keeping your coins inside a sealed container is so important - the container greatly slows this process down.</p><p><br /></p><p>Again, the speed at which this can happen will vary greatly as it is dependent on several variables. But, under certain conditions it can happen very quickly, or it can happen very slowly. That time frame can vary from a few hours to many years. The variables involved are the same as they always are, temperature, humidity, light, air pressure, and air content. And the frequency with which any or all of these change.</p><p><br /></p><p>All of this is exactly why the steps for proper storage are so simple, yet so important. The ideal is to minimize and maintain the consistency of these things.[/QUOTE]</p><p><br /></p>

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