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
Copper
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.
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.
The color of a copper patch applied to a metal coupling would typically be a reddish-brown, similar to the natural color of copper.
To make fake gold less yellow, you can mix in a small amount of silver or copper to adjust the color.
Copper changes color to green either because of the weather or a physical change
The color of copper mineral is typically reddish-brown or metallic brown.
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.