Just dis-assembled Alt., glass beaded case and want to clean copper center outer ring as well as re-paint center piece.

How do I clean the center piece (copper)?
What color do I paint the center piece? Thanks

7521225-Alt3.jpg (103 downloads)
1963 Chrysler 300 Pace Setter Convertible 21K mile survivor 1969 Dodge Coronet 500 1956 Desoto Hemi 1955 Chrysler C300