bluing


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bluing

[′blü·iŋ]
(metallurgy)
Also spelled blueing.
Formation of a bluish oxide film on polished steel; improves appearance and provides some corrosion resistance.
Heating of formed springs to reduce internal stress.
A blue oxide film formed on the polished surface of a metal due to extremely high temperatures.
(plant pathology)

bluing

The addition of a small amount of clean blue colorant to a white paint to promote the visual perception of whiteness.