"Randal O'Brian" wrote in message
...
Stainless steel blackening is a standard service offered by some
gunsmiths.
It works by converting the chrome on the surface of the metal to chrome
sulphide in a hot bath similar to the hot black oxide system used for
carbon steel but with different chemicals. www.brownells.com sells the
all
the stuff you need to do.

How does it hold up to abrasion, Randy?

Ed Huntress