The actual process is called "Steam Bluing". The only real trick is heating the metal up in the presence of moisture (Humid air is good enough). Actually had customers do it by accident in tempering furnaces that I was working on a few times.
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'11 370Z Nismo #528 Fast Intentions | Stillen | Motordyne | Uprev | CSF | Zspeed | Z1 Motorsports | AST | Swift | SPC | SPL | Whiteline | Hotchkis | Bride | Schroth | Robispec | Cusco | Nismo | Volk | Forgestar | Hoosier | RJM
'17 Titan Bone Stock
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