I added a few copper coated steel BBs to some of my Tamiya acrylic paint jars to help mix/shake them. I noticed today when checking an almost empty jar of the x-21 flat base that there was dark crud at the bottom of the jar covering the BBs, although they still looked copper coated. I fished a few of them out of a jar of X-2 gloss white that was almost full, and the copper coating on the BBs appeared to be gone.
Did I mess up using this type of BB? I'm reluctant to use these paints in an airbrush, not knowing if I'll be blowing some type of copper oxidation gunk through it. I'm thinking I could still use these for paint brushing, though. Anyone else ever have this problem?