A planet that has 56% nitrogen, 40% oxygen, and 3% sulfuric dioxide has life on it. The most efficient color of blood on Earth is red iron based blood. What would be the most efficient pigment for their blood?
closed as unclear what you're asking by Mołot, sphennings, Azuaron, MozerShmozer, Aify May 1 '17 at 21:33
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Blood is red because of the way iron and oxygen interact in the hemoglobin, not because of pigment. To know what colour the blood should be, you'd have to design your own hemoglobin equivalent to fit that environment and work out what colour it would be. That's a lot of work, but if you want to do it, more power to you