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Yes, they can be stripped clean and then polished (raw brass), or a new coat of lacquer or other finish can be applied.
Brushed nickel has a brushed dull finish. Polished nickel has a smooth shiny surface.
A high polished blue finish.
Melachite is a bright green mineral that can be shined to a high polished finish.
what the difference between 1000 grit and 1000 polished finish on a bowling ball