“Green is a colour, the perception of which is evoked by light having a spectrum dominated by energy with a wavelength of roughly 520–570 nanometres. In the subtractive colour system, it is not a primary colour, but is created out of a mixture of yellow and blue, or yellow and cyan; it is considered one of the additive primary colours. On the HSV colour wheel, also known as the RGB colour wheel, the complement of green is magenta; that is, a purple colour corresponding to an equal mixture of red and blue light. On a colour wheel based on traditional colour theory (RYB), the complementary colour to green is considered to be red.” (from Wikipedia)
