Bluing (other)
Bluing may 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 (steel), a passivation process in which steel is partially protected against rust * "bluing" of machine parts to check for tolerances, see engineer's blue Engineer's blue (also known as scraping blue, Prussian blue, or simply bluing) is a highly pigmented paste used to assist in the mating of two or more components. History Joseph Whitworth popularized the first practical method of making accurat ...

Bluing (fabric)
Bluing, laundry blue, dolly blue or washing blue is a household product used to improve the appearance of textiles, especially white fabrics. Used during laundering, it adds a trace of blue dye (often synthetic ultramarine, sometimes Prussian blue) to the fabric. Uses White fabrics acquire a slight color cast after use (usually grey or yellow). Since blue and yellow are complementary colors in the subtractive color model of color perception, adding a trace of blue color to the slightly off-white color of these fabrics makes them appear whiter. Laundry detergents may also use fluorescing agents to similar effect. Many white fabrics are blued during manufacturing. Bluing is not permanent and rinses out over time leaving dingy or yellowed whites. A commercial bluing product allows the consumer to add the bluing back into the fabric to restore whiteness. On the same principle, bluing is sometimes used by white-haired people in a blue rinse. Bluing has other miscellaneous hous ...
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Bluing (hair)
A blue rinse is a dilute hair dye used to reduce the yellowed appearance of grey or white hair. The blue rinse gained popularity after Jean Harlow's appearance in the 1930 film '' Hell's Angels''. Queen Elizabeth The Queen Mother Elizabeth Angela Marguerite Bowes-Lyon (4 August 1900 – 30 March 2002) was Queen of the United Kingdom and the Dominions of the British Commonwealth from 11 December 1936 to 6 February 1952 as the wife of King George VI. She was the l ... also contributed to the popularity of the blue rinse in the 1940s. Politician Benjamin Netanyahu uses this style. In British politics, the term ''Blue Rinse Brigade'' is used to refer to affluent older women involved in Conservative politics, charity work and committees. See also * Blue hair References {{culture-stub Hair coloring ...
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Bluing (steel)
Bluing is a passivation process in which steel is partially protected against rust using a black oxide coating. It is named after the blue-black appearance of the resulting protective finish. Bluing involves an electrochemical conversion coating resulting from an oxidizing chemical reaction with iron on the surface selectively forming magnetite (), the black oxide of iron. In comparison, rust, the red oxide of iron (), undergoes an extremely large volume change upon hydration; as a result, the oxide easily flakes off causing the typical reddish rusting away of iron. Black oxide provides minimal protection against corrosion, unless also treated with a water-displacing oil to reduce wetting and galvanic action. In colloquial use, thin coatings of black oxide are often termed 'gun bluing', while heavier coatings are termed 'black oxide'. Both refer to the same chemical process for providing true gun bluing. Overview Various processes are used for the oxidizing process. "Cold ...
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