Such as red, orange, yellow, purple etc
In: Biology
Eyes only come in one pigmented color, that’s brown. The blue/green/grey eye colors are structural color, not as a result of blue/green pigments.
As a result, there isn’t a color palate for for eye color. That would enable the kind of color mixing where red+yellow = orange.
What causes the colour of human eyes? There is one dial: the amount of melanin in the iris. The gamut (least to most) is blue, green, brown(, blackish?). Since there’s nothing else to change about an eye that affects its colour, no others are possible.
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