At a recent coin club meeting, I noticed that one of the members had some of his silver coins in those hard plastic 2x2s, but he had sealed the edges with pieces of that metal "duct tape" that is often used for sealing metal duct work. He thought that it would make the cases completely air tight.
This seemed like a very interesting idea, so I thought to ask the CCF if they have heard of this or used it?
Ahh, duct tape has GLUE...chemicals ya know? Doncha think t may be a bit risky to add the element of sealed vapors into the mix? It would be just as rediculous to superglue the edges. A quality "Air-tight" by its name is all that is needed or use vacuum sealing food wrapping, that is coinsafe as well!
In the plastic itself is permeable so over time gases will go right through the plastic itself. So the plastic holders may be a resistant but they aren't airtight.
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