In the upper left are a variety of verdigris patinas. Each square represents a slightly different technique and the results can range from statue of liberty green to deep sea blue.
The upper right has some representations of the dark oxidizing colors of liver of sulfur treatment. The colors range from deep woody brown to black to deep gray.
The lower right pieces have been etched with acid and then cleaned with vinegar and salt. They have a matte orange appearance.
The lower left pieces were heated in the oven to high temperatures and depending on the pretreatment the copper comes out with anything up to rainbow colors.
The center piece is just clean smooth copper.
Copper can be manipulated to be almost any color and can even be enameled.
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