Bill- Oscar and I had short conversation on this method several years ago on SSMBBS. He and i agreed that this wouldn't match properly done color case hardening but was acceptable on a gun valued at less than enough to make recoloring worth the cost. I quit posting the method because every time I mentioned a torch people assumed high temeratures and sent Chicken Little in screaming "The sky is falling and your going to blow up your gun. O My God, rush out and meaure the chambers first".
Iodine or a salt brine applied with a Q-tip will give you a dull red, pink if you buff it with 0000 steel wool.
Cary