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I draw file both round & octagon bbls at first, then I further smooth/polishtham with emery paper - backed by a flat board for an octagon bbl, used in a shoe-shine method on a round bbl.
There are entire books on the various browning/bluing methods, but probably the best & most authentic-looking for a home hobbyist would be a rust blue method (google).
An option would be to leave it "in the white", and age it a bit, so that an appropriate patina is achieved - enough to make it look like an old/antique.
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