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Rodolfo
nick_h.
We've been here many times before, recently here https://www.lfgss.com/comments/16749121/incontext/
I'd be a little cautious about dipping a structurally critical hollow component into an aluminium-dissolving solution. Your local high-end anodising shop would be able to do it, but it would be much better to find a source of the same rim which has never been black, they are manufactured and sold through the usual suspects, although the whims of fashion mean they are seldom in stock.