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I do the same, but in a gas forge. I also put a piece of charcoal in the end of the pipe to keep a reducing atmosphere in the pipe. I get no scale at all.

Caution: Do not try the charcoal trick...

Bruno, I think what Pat is saying is that he can finish his post HT grinding on the blade at 320 grit so the finish sanding on the blade is no different that not using the high temp mask. Where it...