Larry Potterfield of MidwayUSA demonstrates the nitre bluing process for coloring firearm parts. This method involves polishing parts to a fine finish, suspending them, degreasing, and then repeatedly dipping them into a heated nitre bluing salt solution. Close monitoring of color development is crucial, followed by quenching in water. The process concludes with oiling and a 24-hour curing period, resulting in a beautiful royal blue finish.
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