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Oct 26, 2022 at 14:17 comment added ojs Yes. I interpreted the setting where secret cabals exist and mysterious materials like selenite are taken seriously as a low tech setting where controlled hardening could count as the kind of flashy but not really that superior process that the OP is asking for. Also, I thought it is worth separate answer because while the other bluing methods are for corrosion protection, it actually related to hardening.
Oct 26, 2022 at 13:58 comment added Nosajimiki The color resulting from case hardening is only random under uncontrolled conditions. But, it can be controlled by the temperature and environment you expose the metal to during tempering and by the quenching method. This is one of the methods of making blued steel referenced in other answers, but only creates a blue coating, not a solid blue metal.
S Oct 26, 2022 at 12:22 review First answers
Oct 26, 2022 at 12:37
S Oct 26, 2022 at 12:22 history answered ojs CC BY-SA 4.0