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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.
Uranus: light blue; the color comes from methane clouds. Neptune: light blue; like in the case of Uranus the color is due to methane. Pluto: light brown; Pluto has never been visited by spacecraft, so the light brown color is an expectation based on the presence of dirty methane ice on the surface.