Red is the color next to orange at the end of the visible spectrum. The wavelength of red light is approximately 620–740 nm on the electromagnetic spectrum.Red is the color of blood, and because of this it has historically been associated with sacrifice, danger and courage. Modern surveys in the United States and Europe show red is the color most commonly associated with heat, activity, passion, sexuality, anger, love, and joy. In China and many other Asian cultures, it is the color of happiness.Red was the first color, after black and white, to have a name, and was the first color known to have been used in prehistoric art and decoration.Since the French Revolution, the red flag has been the symbolic color of revolution, and in the later 19th and 20th century, the symbolic color of socialism and communism.
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