Niter bluing chemicals from Brownells. Stainless steel pot. Heavy leather gloves and face shield. Screen basket for small parts. Propane burner. 1000 degree thermometer from Brownells. Watch chemicals for a long time to come up to 600-700 degrees in pot. Hope you don't end up in the emergency room due to a drop of rain water hitting pot or an accidental spill.
When desired blue/black is achieved, retrieve and drop the parts into oil and allow to stay for a while. The white residue that builds on parts washes off with hot water.
It is not a process to be taken lightly. And you may get the same results by heating the small parts with a torch (flame blued). Just my 2 cents.
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