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Randal O'Brian
 
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Default STAINLESS STEEL Blueing (or blackening)

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.

In case you don't want to go into the business, you could use one of the
finishing houses such as www.techplate.com if a gunsmith near you doesn't
offer the service.

Randy


"my_2¢" wrote in message
...
Does anyone know how to "blue" or blacken stainless steel? I know that
from a cold chemical standpoint a mixture of Selenium Dioxides and
Copper Sulfate is the standard "cold blue" formula for carbon
steel....but how does one darken stainless? With chromium in the steel
the copper method seems useless and an acid preferable....has anyone
used chemical methods in stainless with success? What works?


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