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Quenching questions
I cut out and grinded a knive from an old saw blade.
I am thinking about hardening it in fire till it glows red and looses all magnetisation, and then quench it in vinegar, in order to get a grey-black appearance.
Can i do that, or is it not ok to do?
If not, can i etch it in boiling vinegar without loosing my heat treating?
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