annealing coloration

[france3]

помогите пожалуйста перевести annealing coloration?

Re-sharpening
Sharpen chiselling tools using grinding wheels with a steady supply of water. Reference values are shown in the figure. Take care that no annealing coloration appears on the cutting edges; this impairs the hardness of the chiselling tools.
For forging, heat the chisel to between 850 and 1050˚C (bright red to yellow)
For hardening, heat the chisel to approx. 900˚C and quench in oil. Then anneal in an oven for approx. one hour at 320˚C (annealing color = light blue).

[Chuk]

ИМХО:
annealing coloration - цвета побежалости