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<p>[QUOTE="Publius2, post: 4726262, member: 105571"]I use the Eva-Dry and they seem to work well and take about 12 hours to dry out when saturated. You just plug them into the wall outlet and the internal heater drives the moisture out of the dessicant (green when saturated, orange when dry).</p><p><br /></p><p>But I've done some mind-experiments on alternate ways to preserve our coins from the deleterious effects of temperature, humidity, and atmospheric contaminants while still keeping them relatively accessible.</p><p><br /></p><p>The first thought was a vacuum box but I rejected that. It's hard to build a box that will retain a vacuum, even a slight one and a vacuum leak will just draw in the surrounding atmosphere. Also, most people don't have access to a vacuum pump although most people have a vacuum cleaner that can be used in reverse to establish a small vacuum. Think about those pliofilm bags you see advertised to store your sweaters, etc. where you use a vacuum cleaner to remove the air. Still, while I could devise workarounds, vacuum doesn't seem to be the optimal solution.</p><p><br /></p><p>But, what about the reverse of a slight vacuum which would be a slight pressure, say a few inches of water column, just enough to keep the environment out? So, if we build a box that will seal up tight against a few inches of internal pressure, provide a pressure gauge on the box and valved inlet and outlet connections, we can connect an inert nitrogen bottle and regulator. Then we can purge the air and moisture out of the box and then charge it with a few inches of pressure. A box like this could be constructed from plexiglass and fitted with a sealing lid. You could also use HDPE pipe material (not PVC!).</p><p><br /></p><p>Anyway, just playing with the idea.[/QUOTE]</p><p><br /></p>
[QUOTE="Publius2, post: 4726262, member: 105571"]I use the Eva-Dry and they seem to work well and take about 12 hours to dry out when saturated. You just plug them into the wall outlet and the internal heater drives the moisture out of the dessicant (green when saturated, orange when dry). But I've done some mind-experiments on alternate ways to preserve our coins from the deleterious effects of temperature, humidity, and atmospheric contaminants while still keeping them relatively accessible. The first thought was a vacuum box but I rejected that. It's hard to build a box that will retain a vacuum, even a slight one and a vacuum leak will just draw in the surrounding atmosphere. Also, most people don't have access to a vacuum pump although most people have a vacuum cleaner that can be used in reverse to establish a small vacuum. Think about those pliofilm bags you see advertised to store your sweaters, etc. where you use a vacuum cleaner to remove the air. Still, while I could devise workarounds, vacuum doesn't seem to be the optimal solution. But, what about the reverse of a slight vacuum which would be a slight pressure, say a few inches of water column, just enough to keep the environment out? So, if we build a box that will seal up tight against a few inches of internal pressure, provide a pressure gauge on the box and valved inlet and outlet connections, we can connect an inert nitrogen bottle and regulator. Then we can purge the air and moisture out of the box and then charge it with a few inches of pressure. A box like this could be constructed from plexiglass and fitted with a sealing lid. You could also use HDPE pipe material (not PVC!). Anyway, just playing with the idea.[/QUOTE]
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