Here's some directions I got out of the AM Rifleman in '96..
1. Polish and degrease using plastic gloves.
2. Heat until water sizzles, then let cool for just a short time.
3. Using a paper towel, swab on 44-40 or Oxpho-blue.
Keep rubbing it in until the metal has cooled to the point at
which it no longer vaporizes the cold blue solution. Use in a
well ventilated area and use plastic gloves.
4. Let it dry for a few hours, then card off any loose coating with
clean steel wool. Rub with a clean paper towel.
5. A day or 2 later, apply cold blueing by using just a small
amount at a time and rub it in vigorously.
Again polish with clean steel wool. Repeat this step until the
blueing does not thin. The plastic gloves are a MUST because
the oils on your hands will result in streaks.
6. Wash the gun in hot water and heat just enough to evaporate
any residue.
7. Heat the gun again until water sizzles on it, then while still hot
apply some good gun oil. When the gun cools, wipe the excess
oil off.
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This method works pretty good and the 2 main things are:
1. degrease completely!
2. never touch the metal with bare hands!