Question about humidity/coin holders
I keep all of my coins in a fireproof/waterproof safe. I have silica desiccants in there, but recently put in a hygrometer and realized the humidity was very high (70%+). I open the safe every 1-2 months at least.
This got to me to thinking. How much of a problem is humidity with coins, especially with those in cases or slabs?
And when a coin is slabbed, isn't that coin air tight, meaning it is trapping in moisture?
Just curious how paranoid I should be since my whole collection was stored in this safe and I was shocked to see how high the humidity was.
Thanks for any input.