Fire Bluing
Would like to know the "formula" for fire or nitre bluing parts, such as seen on the front site, grip screws, toggle pins and even magazine pins. Randall Gibson on page 51 of his Krieghoff Parabellum, states that heating the part in a 550 degree oven for fifteen minutes gives the part a deep blue color. But is this the fire blue color? Would appreciate opinions from our expert refinishers.
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