Been removing the active rust, and have found that it's been working long enough to leave big, very ugly patches of black inactive rust all over the barrel's upper surfaces. I'd love to remove these but gather that inactive rust is bonded with the steel pretty firmly; noting Ward's recommendation of brass dental picks, would a brass brush do the same sort of job? Also, discovered that the green "copper" corrosion is indeed attributable to brass - consultation with a nearby expert on Oriental (i.e. non-Occidental) arms suggests it's part of the brazing that held its pan in place back when it was a matchlock (!); in the same area, the nipple carrier is seemingly screwed into the touch-hole, and the breech plug looks to have been (very crudely) welded in place. Eesh. Makes one leery of trying to shoot such a thing.
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