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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 amount of helium in its atmosphere. Uranus's atmosphere is made mostly of methane, which reflects bluish-green light. The absorption of red light by methane crystals in the upper atmosphere of Uranus gives it its blue/green appearance.