I am currently writing a sci-fi novel and have come upon a rather ponderous question that I have thus been incapable of discerning an answer for. If a planet were to have oceans composed not of water, but rather of ethanol or a similar alcohol, what would they look like from space, assuming an atmosphere similar to earth's? What I've found thus far implies that ethanol and other pure alcohols are simply clear, however, in small quantities (such as in a glass), water also has an apparently clear color. Knowing that water, in larger quantities, absorbs red, yellow, and green light more readily than blue, making it appear blue, I was assuming that other liquids might perform similarly, making large quantities of them a far different color than in isolated quantities.


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