ltwguns.com

When it comes to pistol finishes, specifically the different bluing techniques, how hot is too hot? Normal hot tank bluing runs about 275-300 degrees, and nitre bluing (usually confined to small parts like pins and screws) goes around 600 degrees. I can't find a reference on the temp used for Carbonia or "charcoal" bluing, but I would imagine that they go at least 500 degrees. At what point, temperature wise, does the high temperature compromise the heat treatment of the steel?

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Wayne Miller