If you are looking to add a unique finishing touch of color to your firearm, nitre bluing is the answer. Although it doesn't wear as well as hot salt bluing, nitre bluing (also known as fire blue) creates a beautiful array of colors to personalize your design.
Unlike conventional hot salt bluing, nitre blue can produce a lustrous range of colors from a pale yellow "straw" color like the older Luger parts to a bright peacock or "fire blue" finish used on Colt and Smith & Wesson revolvers of the 1850's through the 1930's.
The process involves immersion of the part into a hot liquid potassium nitrate, which generates an evenly colored finish. Like all bluing processes, the most important step is metal preparation. The metal surfaces are block sanded to remove all imperfections and then polished to a mirror shine just before the bluing process, which avoids oxidation of the steel. Although Fire Blue creates a lustrous finish, it is not as durable as conventional hot salt bluing, turning a patina color with wear.
Fire Blue yields a gorgeous appearance whether it's the entire firearm, or just a splash of color with the hammer, trigger, pins and screws, which look great next to Color Case Hardening or high-polished Nickel Plating.
The following firearms are examples of Tyler Gun Works nitre bluing.