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Ed Angell
 
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Default STAINLESS STEEL Blueing (or blackening)

Back in my aerospace processing days, black oxide on SS was done with a
fused salt process. As the name implies, certain chemicals are melted at
around 950 F. to provide the blackening environment, not something you want
to do in a home shop.

Ed Angell

"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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