There is a way to lighten them; Hoppe's #9 Copper Solvent. I once cleaned a Colt SAA and left the solvent on the frame for a couple/three days. Colors lightened considerably.

The problem, as Bill has brought up, is applying a selective process. Maybe you could try just putting some on one spot of blue and watching it like a hawk until it reaches a shade you like(?).

Last edited by Krakow Kid; 01/13/11 05:41 PM.