I don't keep cards in my gun safe, but I do have two different reusable desiccants in it. One is a can that you can put in the oven to recharge (a couple of hours at a low temperature) and the other plugs into the wall to recharge. I assume that there is some type of resistance heater contained in the package.
They seem to do pretty well.
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Working Sets:
Baseball-
T206 SLers - Virginia League (-1)
1952 Topps - low numbers (-1)
1953 Topps (-54)
1954 Bowman (-2)
1964 Topps Giants auto'd (-2)
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