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[–] The_Exodite ago 

Lower frequency spectrum, I'd venture to say. We can't see infra-red, and we can't see ultraviolet, and magenta-red is moving to the extremes of our visual perception.

not a doctor

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[–] 5785779? ago  (edited ago)

Actually, humans can see ultraviolet, but it's filtered out by the lens in the human eye that focuses light. Some people are born without that lens, or some people lose it due to disease or injury, describe ultraviolet light as "blue-white".

Color is incredibly fascinating. It's something that we think we kind of understand, but really have very, very little understanding about, because perception of the signals coming from our eyes is determined by the mind which we don't understand.

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[–] OneTrueCube 0 points 4 points (+4|-0) ago  (edited ago)

Just did some homework. Magenta is an interesting color - it doesn't actually exist in the visible spectrum, but is a product of the brain.

Basically, magenta is equal parts blue and red without any green. Yellow is an altogether different color, so it makes sense that there would be less delineation between magenta and red, than yellow and red.

Edit - to further reinforce that it's more an effect of the brain, magenta's wavelength parks around 500-530 nanometers. Yellow sits at 570-590, and red is at 620-750. You'd think that because magenta is "further" away from red, there'd be more difference. But since magenta is made by having equal parts red and blue, I guess you could say that it's already halfway red.

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[–] issueninja ago 

I'm not sure if this is the right answer but I do know that the smallest things we can see with light are yellow. Yellow has the smallest wavelength of the colors, so some things which are too small to reflect the other colors (and so are invisible) can still reflect yellow and be visible. Maybe that is part of the answer.