What color in the Red Badge of Courage is used the most?
Several colors are used symbolically in Crane's novel; Color in general is used to reflect feeling, usually negative or painful. I don't know exactly which one is used "the most" but here are some contenders:
Red: The title of course, referring to blood; Henry stood before a crimson and steel assault”; he “soared on the red wings of war”;
Blue: Henry is a "blue desperate figure” and “a blue, determined figure”; the army was “a blue machine.”
Black: “the black weight of his woe”;