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  1. Gun Bluing Basics: All of the Methods Gunsmiths Use

  2. Nitre Bluing - Turnbull Restoration

  3. Bluing (steel) - Wikipedia

  4. TFB Armorer's Bench: Education on Bluing Types & Processes

  5. Bluing - T & D Metal Works

  6. How to Nitre Blue Gun Metal for a Beautiful Finish - YouTube

  7. Nitre Blue | American Bluing & Guns, LLC