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<p>[QUOTE=&quot;WeirdFishes, post: 1777014, member: 41261&quot;]Important things you should know: To prevent your coins from tarnishing or oxidizing the best thing you can do is first have your coins encapsulated by a TPG as this will provide you with an excellent form of protection from any physical damage to the coin. These slabs are not air tight nor are they vacuum sealed. If you really wanted to put your coins away for long term storage purposes, you would put your slabbed coins into a metal box with refrigeration fittings on it. Refrigeration fittings or hardware are rated for operating in a vacuum. It would require some customization to be done, in order for refrigeration service ports to be added to the metal box but once you have a sealed box you would be best served by using a vacuum pump to pull the box into a deep vaccum meaning sub 500 microns. You can then break the vacuum by introducing a small volume of dry nitrogen inside the box. The box will still be in a slight vacuum and it will also contain the best desiccant one could hope for: Dry N2.[/QUOTE]</p><p><br /></p>

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