The Mars surface color looks reddish from a distance because of rusty dust kicked up in the atmosphere. From close up it is more of a butterscotch, and other common surface colors include golden, brown, tan, and greenish, depending on minerals.
The apparent color of the Martian surface enabled humans to distinguish it from other planets early in human history and motivated them to weave fables of war in association with Mars. One of its earliest recorded names, Har decher, literally meant "Red One" in Egyptian. Its color may have also contributed to a malignant association in Indian astrology, as it was given the names Angaraka and Lohitanga, both reflecting the distinctively red color of Mars as seen by the naked eye. Modern robotic explorers have shown that not only the surfaces, but also the skies above may appear red under sunlit conditions on Mars.
Explanation from: https://en.wikipedia.org/wiki/Mars_surface_color
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