Did a google and found this
http://www.jouster.com/articles30m1/parkerizing.html

neil




"Randal O'Brian" wrote in message
...
Brownells sells everything you need to do it. www.brownells.com It is
more rust resistant than black oxide since the coating is porous and holds
oil better. Also, surface prep is not as important as with oxide as it
will
cover shallow surface scratches. The color is variable and can be
gray-green, black or dark gray depending on the solution you use.

Randy


"George" wrote in message
...
Does anyone have info on the Parkerizing coating process such as used
with firearms? Would it last better on tools than black oxide?

--George