what is the powder these knifemakers sprinkle on the blades during the bashing process
Cocaine.
Trufax.
Usually sand, it's used as a sort of flux. [Edit] In the BBC film, it's clearly not sand. I suspect he's gone high tech and is using borax.
@dicki started
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what is the powder these knifemakers sprinkle on the blades during the bashing process