To anneal, it would be a good idea to find a larger piece of mild steel that is thicker than the knife and heat it up at the same time and bury them both in the ashes. The mass of the other piece will help slow the cooling process even more and you will get a better anneal.
As for the tempering, I go to 425 for two hours, then test. Ajust as required to get the results you want.
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