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bluing

Bluing may refer to:
Bluing (fabric), blue dye used to improve the appearance of fabrics
Bluing (hair), blue dye used to improve the appearance of hair
Mrs. Stewart's Bluing, brand of fabric and hair bluing
Bluing (steel), passivation process in which steel is partially protected against rust
"bluing" of machine parts to check for tolerances, see engineer's blue

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