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In a nut shell:
The part is immersed in boiling water, when it is removed the heat causes the water to evaporate leaving dry, hot metal.
The bluing chemical is swabbed on the metal, and allowed to work for a period of time.
The "rust" that is formed, is "carded" off with steel wool, and the part is placed into hot water again.
The process is repeated, until the depth of finish is obtained.
There are a number of variations of this process. Although very slow, it is a process that can be done at home, and is the best "true blue" gun finish there is. This is the process some of the very high-end custom 'smith's use.
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