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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.
The methane in the atmosphere of Uranus and Neptune is what causes their colors to appear blue-green and bright azure blue respectively. When the sunlight is applied to a surface it can reflect light back, but since methane is present it absorbs the red light of the light spectrum, thus the only light being reflected is the blue and green light.