when its another gun such as in the case of the Python, the "reddish" color is most likelly due to improper bluing temperatures, thats how one tells when a gun is "redone"...the Rugers it is the "mix" of the batch of the alloys when they cast the various parts, they will plum, no matter what and yes when you ( we did) reblue them they will turn again to the 'plum'......it used to be with some guns ,like Winchester and their "nickel" steel, to get them to actually "blue" completely you had to run up th e temps, over normal specs ,maybe a couple of times, for it turn blue (darken)..... lot to learn when doing "bluing"and the various salt baths...big, big difference in "redoing a gun" , and doing it properly, there are blue jobs and there are "restorations":cool::rolleyes:;)