For The Courier-Journal Long hair. Black, brown, red and blond hair. That's because all visible hair is made up of dead cells.
Hair grows from a hair bulb under the skin.
As the cells of the hair bulb divide, the older cells push through the skin. That cuts these older cells off from the blood supply that nourishes the hair bulb, and the hair starts to form a hard protein called keratin. As this occurs, the cells die. That's why haircuts don't hurt. Well, it depends.