Bluing

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)