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<p>[QUOTE=&quot;WeirdFishes, post: 1777176, member: 41261&quot;]O hell yes. I mean expensive is relative. But for the vast majority of people who lack any knowledge of things such as how to go about creating and maintaining a deep vacuum, indeed this would be an expensive endeavor. However, I am confident I can construct such a storage unit for the cost of the materials only so about $150. There are a few things u need to know about storage of coins in a manner such as this. First, this is meant for LONG term storage. On the order of decades without opening (the longer the better). And I should really correct a previous statement I made. With regards to putting the coins in a deep vacuum (200-500 microns), I would first pressurize the cointainer with Dry Nitrogen (N2). I would add maybe 0.5 psig of dry nitrogen and allow the N2 to work its magic. Inert Dry Nitrogen is a fabulous dessicant meaning it will do a great job of removing moisture inside of the box. I would purge this storage container (with the coins inside, as u want the nitrogen to come in contact with the slabs or raw coins). Gaseous Dry Nitrogen (N2) can be easily found at welding supply stores, and I can say from experience and surrounding coins in an atmosphere of N2 is in NO WAY harmful to coins of any metal or alloy. So after purging the box 3-4 times, always adding just under 0.5 psig of N2, then opening a valve which allows the N2 to leave the box and the pressure inside the box to return to atmosphereic before adding in another 0.5 psig of N2. So after doing this purge for 3-4 times over a day or two I would lastly hook up the vacuum pump and a good quality dual thermistor style analog vacuum meter, and pull the box into a deep vacuum finally. In pulling a deep vacuum inside of the box you are removing the ingredients needed for the oxidation process to occur. The main ingredient would be the Air of which 20% is Oxygen. The removal of all non-condensible gases within the box ensures an environment free of the components necessary for a coin to oxidize. I would finally break the deep vacuum by adding just a small amount of dry nitrogen so that the pressure inside the box would be just slghlty positive. If anyone has any other questions or is actually interested in how to store coins in the most advantageous manner so as to assure they remain looking as good as they do right now, by all means feel free to drop me a line. But to answer the poster&#039;s question, yes..</p><p>Expensive[/QUOTE]</p><p><br /></p>

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