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- Jan 6, 2005
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Don't trust tempering colors, unless it is your ONLY option for heat control. If that is the case, the piece needs to be taken to bare metal and completely degreased. You also have to do it in one shot or you'll be temper coloring the thin oxides you previously brought out.
I personally wouldn't nitre blue any blade intended for real use. 500-600F, even for a short time would certainly effect thin cross sections.
You can get some interesting colors by applying cold blue solution prior to tempering... and it wears much better.
I personally wouldn't nitre blue any blade intended for real use. 500-600F, even for a short time would certainly effect thin cross sections.
You can get some interesting colors by applying cold blue solution prior to tempering... and it wears much better.