I would propose using renaissance wax. Keeps brass brassy. Made in england, dries hard very fast. Resists fingerprints too. Bottle says "Refined waxes blended to a formula used by the British Museum and restoration specialists internationally to revive and protect valuable furniture, leather, paintings, metals, marble, ivory and many other surfaces both housed and exposed to the weather. Freshens colours, imparts soft sheen."
I don't know all that, but it does work on silver, brass, and copper in my experience.
It isn't easy, kind of like polishing shoes. Its not shiny wax either. But after buffing it stays on well. I would say forever, but I am not that old yet. Use or handling rubs it off in time, but I have made anticlastic bracelets, darkened them, then finished with this stuff. No tarnish years later, even through wearing.
Chilly
