I'm having a problem with Mark Lee Express blue that perhaps one of you can help me with. I have been trying to blue a 1909 Colt revolver. The parts are rather highly polished and have been cleaned repeatedly with acetone as well as boiling with a degreaser. The problem is that I am having a difficult time getting some areas to rust. They get discolored after applying the blue, but don't really rust. In the past I have used the same blue and techniques on rifle parts and had no problem. Any ideas?
Thanks.