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Why do we see violet beyond blue in the spectrum?

Nov25-12, 10:47 PM

#18

Pythagorean Recognitions: Gold Member	Why do we see violet beyond blue in the spectrum? I remember hearing a suggestion that female humans were occasionally capable of 4 pigments. The wiki has some references (that I haven't read): http://en.wikipedia.org/wiki/Tetrach..._tetrachromats

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