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Bluing, sometimes spelled as blueing, 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 or blueing: A passivation process in which steel is partially protected against rust, and is named after the blue-black appearance of the resulting protective finish. True gun bluing is an electrochemical conversion coating resulting from an oxidizing chemical reaction with iron on the surface selectively forming magnetite (Fe 3 O 4 ...
The Colt Python Hunter was the first field-ready handgun hunting package made by a major handgun manufacturer. It was discontinued by 1990 and briefly offered as a Colt Custom Shop model afterward. [29] In 1981, Coltguard, a proprietary electroless weather-resistant plating, was also made available. The stainless Python was reintroduced in 1984 ...
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Black oxide is a true gun bluing. However, not all gun bluing is black oxide based. As you note, the MIL references and standards mentioned do refer directly to black oxide. Take a look at the Parkerizing and Phosphate conversion coating articles; one is on historical Parkerizing, and the other is on modern phosphate coatings. Perhaps the same ...
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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