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Yes, but all sorts of things, in a knife, will shave arm hair in a brief trial, which are no good at all for a razor. That is why razors are commonly tempered to such a hardness that they will break...

In the early days of cutlery steel it was difficult to make a steel that wasn'[t either low-carbon and good for nothing harder than a spring, or hard steels which would be brittle. That was what put...