Couple of minor points -
1) Parkerizing is not the same as black oxide. See post #70 for parkerizing. It is very durable and corrosion resistant.
2) Actual black oxide is a nasty process and not easily done at home. It is cheap and easy as an industrial process and has some durability and corrosion resistance.
3) Blackening is not the same as black oxide. It does give useful surface colors and is easily done at home. Not very durable or corrosion resistant.
4) Rust blacking or bluing is a traditional firearm finish and while not difficult it is time consuming. This involves uses an acidic solution to do very mild controlled corrosion and then converting those oxides in boiling water. Then carding off some residue. Repeat for darker coating. This is the only home process I know of that does a black oxide conversion that becomes part of the steel.
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