Greetings from a new guy. Two years ago I had a gun case custom built in my den. The wood is beautiful sunken cypress. The half rounds where the barrels rest do not have any covering (it seems to me that they often have green felt or something similar). The guns, all nice doubles I inherited from my father in law, seem to be losing their bluing where they come into contact with the wood. I'm at a loss to understand why. The guns only get moved a couple of times a year and so shouldn't be rubbing. Does anyone have any reasonable explanation? I'd like to get the guy who made the gun case fix the problem if it is something he should have known about. Anyway, thanks for any opinions offered.