I have several guns in a subset of the calibers I own that require vastly different loads for matters of safety and accuracy. As such, I typically keep hot loads in nickel cases and in separate ammo boxes but I was wondering if anyone has any experience with coloring their brass. By coloring I'm not meaning to imply marking the brass with markers or paint on primers but rather actually changing the color of the brass. I've read of people doing this accidentally when cleaning with non-traditional cleaners but does anyone know a consistent way in which to do this?

I have looked around and have found ways to patina brass to specific colors (see link below) but I wanted to ask around on here before experimenting. I would love to have X color 9mm for gun A, Y color 9mm for gun B and so on.

Patina Formulas for Brass, Bronze and Copper