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why cant our eyes be more colors?

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Eyes are almost entirely coloured by the melanin pigments, eumelanin that is brown or black and pheomelanin that is yellowish. Eumelanin predominates in brown and black hair and theomelanin predominates in blonde and red hair, so it would probably be possible to have quite yellow or orange eyes with a large amount of theomelanin. I'd hazard a guess this is the case with yellow-eyed animals.


Albinos lack melanin, so the blood becomes visible.

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