Rolite Metal Polish on Copper does an outstanding job of removing the effects of oxidation which causes the copper to become dull and have a green cast to it.
All metal surfaces need a protective coating of wax, lacquer or polyurethane to prevent the air from reaching the surface of the metal or oxidation will occur.
The ingredients in Rolite Metal Polish remove the oxidation and discoloration to leave a brilliant shine.
Rolite Premium Metal Polish 