Fact: There is no such thing as the color "purple." Purple is not a color. Purple light does not exist. Some colors, like yellow for example, can be created by mixing two different colors of light (red and green, in this case), or can be made up of a single wavelength (like a laser.) But you will never see a purple laser. That's because there's no such thing as purple light. There is no single wavelength that looks "purple." Any time you see purple, you are seeing two (or more) pure colors (various shades of red and blue) mixed together.