There is a coating process called Armaloy that was developed in the 1960's. As I recall, one of the options was for a black chrome finish which resembles bluing. The finish was very hard, and provided not only good looks, and strong wear capabilities, but also assisted in the reduction of friction in moving parts. I remember several gun industry magazine articles on the process and all were positive in evaluation. This may be the process used to "color" the stainless guns produced by AIMCO to look like they were blued. I never used the process myself, but I remember it was very pleasing to the eye.
http://www.armoloy.com/
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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