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Yellow is the color evoked by light that stimulates both the L and M (long and medium wavelength)...

Yellow is the color evoked by light that stimulates both the L and M (long and medium wavelength) cone cells of the retina about equally, with no significant stimulation of the S (short-wavelength) cone cells. Light with a wavelength of 570–580 nm is yellow, as is light with a suitable mixture of somewhat longer and shorter wavelengths. Yellow's traditional RYB complementary color is purple, violet, or indigo, while its colorimetrically defined complementary color in both RGB and CMYK color spaces is blue. The word yellow comes from the Old English geolu, or geolwe which derived from the Proto-Germanic word gelwaz. The oldest known use of this word in English is in the Old English poem Beowulf, in a description of a shield made of wood from a yew tree. In the English language, yellow has traditionally been associated with jaundice and cowardice. Yellow is associated with the word "caution" and is the second light on stop lights; in American slang, a coward can be said to be "yellowbellied" or "yellow". The color is associated with aging as well, for both people and objects (e.g. "yellowed" paper). Ethnographically, the term "yellow" has been used as a slang term for both Oriental