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Excellent explanation - thanks, appreciate you taking the time to explain that.

Yeah, I was doing this - until i started reading about hydrogen embrittlement.
Apparently not the way to go with bladed tools.

+1 on the above process.
I do a lot of axe head restores.
One minor, but faster method - after the vinegar - if the rust comes off and is not in deep pits. You can easily strip it off with a wire...