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The color of Uranus is a blue-green color, and the color of Neptune is a bright azure blue. The reason this is the color of Uranus is due to its atmosphere and its ability to absorb different bands of light.
In some photos released after 1986 Voyager 2 fly-by Uranus looked bright green, but that color was artificial. Neptune: light blue; like in the case of Uranus the color is due to methane. The surface of Neptune appears darker than that of Uranus due to dimmer illumination (greater distance from the Sun).