>>373397>Don't heat up the blade of a knife without knowing how to re-temper it. You just destroyed that knife.Not the temper, he killed the hardening, temper is something different.
And yes, you should never ever heat a knife blade beyond ~200C° OP, if you heat it to red heat with a torch you now have a unhardened blade.
Other than that a cool idea OP, if you are interested in the topic of nordic knife making I'd recommend
Knivsmeden - knivmakerabeid og smiing, by Håvard Bergland
