A better question is what color would your
skin be if your blood were blue.
The answer is that it doesn't change much.
Squids and octopus do have blue blood, but their
native skin color (which is usually a pale white
or deep red) isn't much affected by the color of
their blood. It's only when your blood rushes to
the surface (blushing) that the color of your
blood changes the color of your skin.
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