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THE Liberty's face was copper color (color of a penny)
Colloidal copper has a slight blue color.
Purple wasn't a Remington color.
Copper changes color to green either because of the weather or a physical change
The color fades as there is a discharge of copper two ions to form copper atoms
Copper takes on a brownish color, I've used copper dust in chem that was greenish-blue, that's a pretty popular color. when copper is burnt it produces a green flame, I've also used copper that was gray and greenish-blue in non manufactured copper things I'd look for a bluish green color.
The metallic PMS color for copper is 876 C. Ignacio Martinez
light orange
copper
brown to copper-red color
Red
copper