Definitions for "blueing"
Heat treating a piece of armour in order to produce a "blue" oxidized finish. The process involved super heating the armour to a certain temperature, then cooling in oil or water.
used to whiten laundry or hair or give it a bluish tinge
a process that makes something blue (or bluish)
A decorative heat treatment applied to metal weapons which also protect from rust.
The process of artificial rusting to colour metallic parts various shades of blue or black.
Same as bluing.