Bluing (steel) is a passivation process in which steel is partially protected against rust
Bluing may also refer to: Bluing (fabric), a blue dye used to improve the appearance of fabrics Bluing (hair), a blue dye used to improve the appearance of hair "bluing" of machine parts to check for tolerances, see engineer's blue
See also Bluey (disambiguation) Blued (disambiguation) Blue (disambiguation)