Pretend that you are talking to a blind man and have to describe for him what "red" is. You should use narrative and descriptive writing techniques, and try to appeal to his other senses!

Don't think of Red as a color. Think of  it as an emotion. Red is the thrill of infatuation, love, and passion. However, Red is the sensation you feel when you are infuriated. Red is hatred. Red is war. Red is revenge. Red is the taste of Burgundy Wine, the immense heat of a Chili Pepper resting on your taste buds. Red is the burning sensation felt when you set your hand on a heated object. Red is the scent of freshly cut roses in the midst of a summer day.