I don't think Borchardts or Lugers were ever done by the nitre method...I have a Uberti 1873 done that way, and the blue is verrry bright and brilliant, but very fragile and wears off easily. I've been experimenting with 5 different rust bluing solutions including Laurel Mountain, and I'm going nuts trying to get a blue finish and not a black one. Thor says he has found the "secret" process of doing it, but of course he's holding it as a trade secret. I'm stumped.
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