Having read Dr. Gaddy's DGJ article on case hardening, I agree with Stan that sunlight likely has no effect on the colors, but certainly, abrasion and acidic or salty perspiration does. I'd add oxidation to that list and anything that keeps oxygen away from the surface will probably help preserve colors. Also, I think certain processes may be more durable in color retention than others. I've noticed that a lot of Hunter Fulton and Hunter Specials, which I believe are cyanide colors, seem to retain a lot of color despite signs that the guns were well used. The same seems to apply to some charcoal colored guns. For some reason, even very nice condition L.C. Smith Ideal grades seldom have strong colors. Any thoughts on this?
Those who use wax to protect colors should remember that wax could entrap abrasive dust and dirt, and some so-called polishing waxes even contain very fine abrasive particles and should not be used.
Canvasback, you would fit in perfectly at our hunting camp where ball-busting has been raised to an art form. If you were here and told me exactly where it hurt... I'd punch you there my friend.