"Light is both particle and wave, and like other waves, moves at certain frequencies. The visible light we see zips in at about 400 million, million times per second depending on the color. Violet (at one end of the visible spectrum), is the fastest, while red (at the other end) takes its sweet time. The other colors in the spectrum, moving at their particular frequencies, are indigo, blue, green, yellow and orange. The color pink, not a part of this spectrum, does not have a particular frequency." - article The Pink Color Doesn't Exist? So Why Can We See It? , posted in November, 2013.
There are two ways for the human eye to see the color pink and its variations:
Treating it like light: according to theoreticians of color from University of San Diego, USA, the pink is the absence of green. By that means, that the pink color results from the white color with all the green light removed. In this case, the pink is to the green the same thing the black it to the white: the absence.
The ophthalmic explanation: at the back of our eyeballs there are millions of rods and cones. The rods are all the same and respond to light or its absence. On the other hand, the cones come in three types: red, green and blue-sensitives; that are activated due to the intensity of the colors that are reflected by the objects. The color reflected the most is the color our eyes see, the others are absorbed. When you look to a pink object, the red-sensitive cones are activated, together with some of the green and the blue (just enough for the brain to understand that this is the pink color).So, to say that the pink color doesn't exist is wrong. We can say that the pink, as light, is an illusion created by our brains.
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