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The blue color of steel parts can be carried out in molten salt of sodium nitrite and sodium nitrate, or in hot air at high temperature and superheated steam above 500 C, more commonly in concentrated caustic soda with sodium nitrite. heating. The composition of the solution, the reaction temperature and the time when the blue color is determined depends on the composition of the steel substrate. The blue film is made of magnetic iron oxide and has a thickness of 0.5 to 1.5 microns. The color is related to the material composition and process conditions, such as grayish black, dark black, and bright blue.