I don't think it's so much a humidity problem in the present time, but maybe a problem in the past. Such as sitting in a holster full of saltwater, or possibly being strapped onto a dead guy laying in a mud puddle, and getting cleaned without ever removing the grips. I also suspect East German bluing salts that didn't get properly rinsed out of the old pitting. I just gotta figure out how to stop it.
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