If we could get back to this person's issue with brown patches coming out when he cleans the bore of his muzzle loader, I would like to find a resolution to this issue in case it ever happens to me again. When it happened to me it was in a barrel that I had blued myself and since I couldn't get the patches to stop coming out with a brown discolleration to them I decided to soak the barrel in Evaporust. Of course I had to blue the barrel over again and unfortunately using a different blue, I had run out of the other, it did not come out nearly as nice. But it did take care of the brown patch problem.