I think there is slight misunderstanding of anodizing aluminum and how it is colored. When aluminum is anodized it grows a thin layer of oxide in small tube like structure (some refer to them as pores) at a right angle to the surface. Dye in whatever color is desired is introduced to the tubes and then sealed typically with a nickel acetate based solution. Perhaps you are thinking of anodizing titanium or other reactive metals where the voltage determines the final color? In any case, once sealed and provided UV resistant dyes were used the color is long lasting and can have a mirror like shine.
Maybe a high phosphorus and trace of silicon would give the reddest color, the phosphorus likely slowing the patina by preventing copper carbonate/oxide?
Look at C65500 bronze (google it for photos)--it has pretty acceptable corrosion resistance, even in salt water. To me it always appeared to be a little red.
Most alloying metals (i.e. nickel, zinc, aluminum, tin etc.) will whiten Cu up.
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