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Message:: [QUOTE="GDJMSP, post: 1215822, member: 112"]Not that many years ago NGC came out with a new and improved slab that they advertised as being airtight. Of course it cost extra for these slabs. But they didn't stick around long because it was soon discovered that the slabs were not really airtight. I'll bet Conder remembers them. You see, there is more to the problem of making airtight slabs than just making sure that the edges of the two halves are 100% bonded together. The plastic itself that the slabs are made out of are air permeable. In other words, air can travel right through the face of the slab, not just the edges. That said, yes, the technology to produce an airtight slab does exist, of that there is no doubt. But, is there a material available that you can see through as clearly as you can glass but one that won't break like glass, that is also thin and lightweight enough for the purpose, and is also cheap enough for that use ? The answer to that question is no. But even more, there is no reason to even try and produce an airtight slab when all a collector has to do to keep his coins from toning is to utilize proper storage methods. Proper storage methods will for all practical purposes protect coins from toning for a lifetime, perhaps even more than 1 lifetime. So why bother trying to come up with an airtight slab ?[/QUOTE]