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Heat Bluing
Heat Bluing or Flame Bluing is actually heat treating. Steel will turn a rainbow of colors as it is heated and if you remove the heat at the right time, you can get a nice "electric" or "peacock" blue color, just like Nitre Bluing. See the colors of the screws on this Colt: If you have ever seen a set of chromed header pipes that got really hot, you probably noticed the rainbow effect and the bright blue color: Here is a chisel that was heated then quenched, you can see the same effect Here…