There is no perfect way, but gold with a tiny dash of red comes close.
Yellow, red and slight bit of blue make copper.
blue
clear, because it's metal. from livingston, NJ
Mineral color is caused by the absorption, or lack of absorption, of various wavelengths of light. The minerals that are used to make the color bright green are copper, nickel and barium.
Copper
THE Liberty's face was copper color (color of a penny)
When copper carbonate is heated, it changes from its green color to black copper oxide.
To make fake gold less yellow, you can mix in a small amount of silver or copper to adjust the color.
The color of a copper patch applied to a metal coupling would typically be a reddish-brown, similar to the natural color of copper.
not pure iron... But you can provide a covering over iron to make it look like copper by just dipping it into copper sulphate solution .. Because Iron is more reactive than Copper ... it will displace it in the solution .. the color of solution will change so as the color of iron!
Copper changes color to green either because of the weather or a physical change
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.