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Reaper got it.
The best you could do with boiling water at one atmosphere (sea level) is about 212 Degrees F.
There is no hardened tool (knife) steel that I know of that could have it's temper harmed at this temperature.
The general "minimal" tempering temperature for a steel which has already undergone its hardening (austenitizing) heat treat phase is 300 degrees F.
There is no blade I've ever made that would be harmed by 300 degrees F after completion. Handles and fittings would be a seperate issue.
The best I would suggest for your blade is to use steel wool and oil and not mess with cold blueing on a knife intended to cut what will become food unless your diet is seriously deficiant in selenium dioxide.
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