I needed to blue the loading lever on an Old Army. Someone took it to white. A used gun my friend bought.
I washed it with Dawn and hot water. I dropped it into boiling water, took it out to dry a few seconds and swabbed Oxpho blue on it. The color came right quick and three applications made it match the barrel perfectly, looks just like a hot blue job. No spots at all.
I have wanted to try it for a long time and it sure works. I got a real deep blue.