good information what Tom said above and what we used to do many years ago, when we had the shop.......... if you can access either 'Zinc phosphate ( that was used to get the gray or even greenish finish , but to get the green,one had to slow cook the parts in 'cosmoline' for a while turned the gun 'green": looked like it was in "storage" ( yes there were shops out there who used to cheat many of these guns back years ago, had to be careful just who you bought off of then, caveat emptor),,,as for the black, either 'black oxide" over a bead blasted finish, but that is a bluing, that is actually 'black' (no niters in the solution), the black in parkerizing is like Tom said above "manganese phosphate" what the military did like on the M-16s and stuff.....and yes it easy enough to do , my wife actually did an old Colt Detective special ,taken all apart and she did it on the kitchen stove just to proove it could be done and yes ,by a girl........
