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@BillB
There was someone on a MTB forum that did small batch annodizing for reasonable money, I can look up his details. Andizing only works on none ferrous stuff IIRC so aluminium and titanium are fair game but steel is not (so no stainless spokes) there are other plating methods for making stainless go black but the really good ones use lead so the ROHS rulings make them VERY expensive.
Find an electroplaters in Yell.com and call them, see what they can advise, where I get my fixings their local electroplaters charge £25/batch to do stuff in Nickle a passive black, but that is
a rate for a LOT of regular work.
I went for Black ACI double butted in the end.