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Not sure....I think they were rust blued back in the day, but with different chemicals...stuff our illustrious EPA says we can't use now. But I will look into it a little deeper...
Damn those 1911's are nice!!!!Late to the party, as always . . . . . but . . . .
This is Color Case Hardening . . . . . slide is blued over color case / case color hardened frame.
Nitre Blued small parts on a blued gun . . . .
And then, what is marketed as Carbona Blue, Carbona Black, or sometimes Carbonia . . . .
Carbona Blue/Black finish by Turnbull . . . .
As opposed to brown-nosing, an entirely different thread...Maybe that's it...browning....
You are correct. That brown finish has an official name. Cain't remember it right now, but will look it up.I have 2 1890ish shotguns from my grandfather, they have a brown finish that I do think is rusted through the blueing. They are both very slick with no pitting visible. Is that something different or just age?