WHen I want a nice black finish I usually heat up to just above black heat and put in a 5 gallon bucket of used motor oil, I usually keep in for about 10 or 20 seconds and if you time it right the excess heat in the piece will burn off the excess oil as you remove your work from the bucket. I get a super nice black that many ask how I did it when I do this to my art pieces, I have also rusted pieces and boiled in water to turn the rust oxide black and that looks good too but the first way is the easiest.
Chris
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