I didn't say we call copper, copper orange. I said we could call it orange.
Another example, high blue vs blue. High blue is a tint of blue, but we call it blue nonetheless. (The picture is a picture of the color "high blue")
Same with some people calling "maroon": "red"
Which is acceptable, it's a reddish color (and a shade of it), it's acceptable for people to call it red despite it being it's own color