... isn't black "chrome" actually black anodizing? And if that's the case, I don't think you can anodize brass, only non-ferrous metals (those without iron) such as zinc and aluminum. Anodizing is actually a chemically produced oxidation process, similar to the rusting of ferrous metals. Anodizing would occur naturally if my bare M6 TTL were left out in the weather. But anodizing produces a natural, protective coating, that actually is etched into the top surface of the metal itself. "Hard anodizing" even makes the surface more scratch resistant that bare metal or paint. I think this might explain why the black "chrome" is more wear and scratch resistant than paint. But a true chrome finish, which I believe what the silver chrome is, consists of an electroplated finish with the element "chromium", a very hard, and even brittle finish. BTW, I don't think you can apply true chrome to a non-ferrous metal before plating it with copper or brass first...