Look closely at a rainbow, and you’ll spot red, orange, yellow, green, blue, and violet, but not purple. That’s because every color in a rainbow corresponds to a single wavelength of light.

Some would consider the definition of purple to be a beautiful color you can create by mixing red and blue together. This is true, obviously, but athletic personnel at Northwestern would argue ...

Though a playing surface's color may seem inconsequential ... An NBC Olympic and Paralympic podcast, titled "Day 12: Red Means Slow, Purple Means Go," some of the members of the United States' tennis ...