Blue
Blue is one of the colors in the spectrum that can be seen with the naked eye. The blue color is one of three basic colors, in addition to red and yellow. Of these colors, blue has the smallest wavelength. The blue color is the common color. Blue is the color of the sky as the light from the sun experiences the Rayleigh motion. Water in quantities is abundant blue because red light is absorbed by water molecules. Blue color is often considered a royal color. Because of this, blue is always used for official uniforms, such as police uniforms. In English, blue symbolizes "sadness" or "melancholy". "Blues" is a type of African American music.