Well, the best way to describe it is that specular values are additive to the diffuse. So like that bronze bit in front, I'd use the opposite(complementary) of that color, but use it lightly. I imagine it would give it that tarnished look... mess around with it in spare time.
Lol youre replying every five minutes XD ^ that was my reply to your first and second post :P Again, your screwing up your specular map. The specular DOES NOT work if you just do a lowerbrightness+upcontrast operation. Quite opposite actually. You first have to understand how a specular map works. Darker the image, lesser…