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Bright Spots of Guns — Can some brother give the method of bluing steel? Some say it is done by heat only, while others say there is a combination of acids with which bright spots on gun barrels and other blue finished surfaces can be re-blued.
At one time gun makers gave a brown finish to gun barrels by means of acids but I believe that the blue finish is never applied in that way. There is a preparation sold by some Chicago house which stains steel a bright blue color, but it is not good for guns, being a sort lacquer.
Bright spots on gun barrels may be re-colored by greasing or oiling the barrel, using almost any kind of oil and there is probably nothing better than kerosene and then holding a red hot iron on the barrel until it draws the desired color. The soldiers often re-blue gun barrels by heating them and then applying oil, but the hot iron method is best where the finish is only worn off in spots.
Rifle sights and other small un-tempered steel articles may be nicely blued by holding in a gas flame or by the side of a coal fire where they will not become smoked, and when quite hot and nearly as dark as desired, plunge in oil and allow to cool. I have used this method frequently.
Harding, A.R.. 3001 Questions and Answers. Columbus, Oh: A.R. Harding, 1913.
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