So I have some very odd discoloration of the slide on my primary CCW weapon, G26 Gen 4. See here... It's splotches that are blue/purple in color. It's a new gun, and that discoloration only appeared after I started carrying. IWB in an MTAC holster. It has been hot as heck here, and humid lately. I think due to the cant of the holster, sweat is going from my body, to the grip, running down that side of the slide, and collecting at the muzzle. There is no discoloration anywhere else. At the end of the day when I disarm, the slide is wet in that area, as is the grip. It has to be sweat, I'm sure. Nothing else is wet. I haven't tried wiping down with oil or anything, just wiped it off with a damp cloth. I'm not too worried about my tools looking pretty, but I hope it doesn't lead to rust or any other issues. Have you guys seen anything like this before? I'm curious if my Gen 4 G19 will get the same look. I haven't carried it yet, as it's new also and with the heat I've stuck to the smaller G26.