What colors make up a rainbow? July 28, 2020February 4, 2012 by Pamela Landy The colors red, orange, yellow, green, blue, indigo, violet make up a rainbow. Related Answers What is the rainbow in Thomas Pynchon’s Gravity’s Rainbow (1973)? How many candies of each color go into the average bag of M&M’s? Do different species of animals have different colors of blood? In The Red and the Black, what do the colors stand for? What do the colors of the black liberation flag stand for? Were red M&M’s ever made with a carcinogenic dye?