Other metal colors are pretty much the same shader, with a different color.

For copper, use less green. Here I used RGB 255, 180, 95.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)