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 02-27-2018, 09:25 Post: 121320
Gunsmith



Join Date: Sep 2007
Location: New Mexico
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 15

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re: Cold Blue
Chemical bluing in hot tanks or cold solutions are generally done because it is cheap. The results are less impressive than the old ways of rust bluing.

Rust bluing can be done on your heat treated ramps and it should give you a more consistent coloring than chemical bluing. It will take longer, however. The cost depends on how much time you want to take with this project.

You can do rust bluing at home. Fundamentally it involves causing a clean iron based surface to develop an even red rust film; gently brushing off the film; rusting some more; until a solid even red coat is seen. The surface is then polished and the red color is converted to a blue by boiling in water. This coating looks like it is part of the metal and is the way many guns were blued until the 1950s or 1960s. If you are restoring old pin ball machines from the early 20th Century, then they were likely rust blued at the time.

Rust bluing has been replaced only because of cost. A quality rust blued finish is head and shoulders above a chemical blue. For spot bluing, I use a product from Brownell's called Oxpho-blue and it works about the best of any of the cold solutions.






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