Do colours exist?

" Colors exist in very much the same way that art and love exist. They can be perceived, and other people will generally understand you if you talk about them, but they don’t really exist in an “out in the world” kind of way. Although you can make up objective definitions that make things like “green”, “art”, and “love” more real, the definitions are pretty ad-hoc. Respectively: “green” is light with a wavelength between 520 and 570 nm, “art” is portraits of Elvis on black velvet, and “love” is the smell of napalm in the morning.

But these kinds of definitions merely correspond to the experience of those things, as opposed to actually being those things. There is certainly a set of wavelengths of light that most people in the world would agree is “red” (rojo, rubrum, rauður, 紅色, أحمر, ruĝa, …). However, that doesn’t mean that the light itself is red, it just means that a Human brain equipped with Human eyes will label it as red."The Physicist

http://www.askamathematician.com/2012/06/q-do-colors-exist/