The only way to do barrels with soldered joints is Rust bluing or Cold Bluing. However rust bluing is the proper method and will by all means yield the best results.
Rust blued Barrels would have a black finish to them. The type of solution can have an effect on the type of shade. But another thing that will have a big effect on the look of bluing is the polishing.
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B. Dudley
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