Pretty sure but don't want to point anywhere specifically; you often see gunblued japanese sanmai knives, "kurouchi", the iron claddings blacken really well. Here's a gunblued carbon monosteel blade. It's used and have some patina on top of the bluingIf you want blue then look at gun blue. Steel guns are blued to keep down the rust. The more you polish the steel the deeper the gun blue will be. I would think a carbon steel knife would like nice with a polished deep blued metal. I have never seen it done but it would be interesting. In my younger days in high school, I had an after-school gun job working for a local gunsmith and one of my tasks was to polish rifle barrels for bluing.
I would worry about the chemicals in gun blueing.
No need to worry imoI would worry about the chemicals in gun blueing.
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