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Archer1440 · August 18, 2002, 01:58 AM

Proper black stainless involves chemically converting the chrome in the stainless to chromium sulfate. I have done this in the lab at work.

The process involves immersion in a molten dichromate salt bath at about 750 degrees F. Very nasty process. Good results. This is how the M1 Garand gas cylinders were blackened years ago, it is a very durable finish.

Of course it might be best to leave it to the professionals:

http://www.robarguns.com/additionalfinishes.asp

August 18, 2002, 01:58 AM	#6
Archer1440 Senior Member Join Date: March 25, 2001 Location: USA Posts: 519	Proper black stainless involves chemically converting the chrome in the stainless to chromium sulfate. I have done this in the lab at work. The process involves immersion in a molten dichromate salt bath at about 750 degrees F. Very nasty process. Good results. This is how the M1 Garand gas cylinders were blackened years ago, it is a very durable finish. Of course it might be best to leave it to the professionals: http://www.robarguns.com/additionalfinishes.asp