I have a small safe for my cards, and I use "damprid" flakes purchased from Home Depot/Lowe's. I made a contraption that consists of two small plastic containers with a crack in the top container (holding the flakes) to let the moisture get into the bottom container.
Is storage in a safe dangerous for our beloved cards? I am not aware of any horror stories. However, I can tell you that the damprid flakes turn to mush and then water in 4-6 weeks or so.
Andrew
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