Purple

Purple is a composite color created by mixing red and blue. Because it does not have its own wavelength of visible light, purple is an illusion of color that is created when both red and blue cones in the retina are fired. It is not to be confused with violet, which does have its own wavelengths and is therefore a spectral color.

Controversy
Because of the nature of purple and its lack of a wavelength of visible light, it is often argued that purple is not a color. This is known as the Purple Debate, which began during a Hanukkah party in December 2017 between Jenna Heskin and Yoshi Askharoun debated about the color of a dreidel.