Why Isn’t Our Hair Naturally Blue?

Human hair comes in a variety of colors; including brown, blonde, and black. Why doesn’t it grow blue or green?

Read More:
Why does the ocean appear blue? Is it because it reflects the color of the sky?
http://www.scientificamerican.com/article/why-does-the-ocean-appear/
“‘The ocean looks blue because red, orange and yellow (long wavelength light) are absorbed more strongly by water than is blue (short wavelength light). So when white light from the sun enters the ocean, it is mostly the blue that gets returned. Same reason the sky is blue.’”

True Blue Stands Out in an Earthy Crowd
http://www.nytimes.com/2012/10/23/science/with-new-findings-scientists-are-captivated-by-the-color-blue.html?_r=0
“For the French Fauvist painter and color gourmand Raoul Dufy, blue was the only color with enough strength of character to remain blue ‘in all its tones.’”

Evolution of the Eye
http://www.scientificamerican.com/article/evolution-of-the-eye/
“The human eye is an exquisitely complicated organ. It acts like a camera to collect and focus light and convert it into an electrical signal that the brain translates into images.”

What do flamingos and salmon have in common?
http://www.webexhibits.org/causesofcolor/7D.html
“With their bright feathers and strongly hooked bills, flamingos are among the most easily recognized water birds. Flamingos are social birds, and tens of thousands can live together in a single colony.”
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