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AFAIK henckels only used the friodur tag on cryo'ed razors. I don't think it makes the razor harder, I thought it makes them less brittle so they could be made harder to begin with.

I don't know. All of mine say Friodur INOX, but Henckels currently makes a 5/8 INOX that isn't marked as a Friodur. There's nothing about the cryogenic process that ties it to stainless steel, the...