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Slightly blue/turquoise. Anyone ever seen a turquoise sky? I've sure as hell seen a turqoise ocean though, the colour is not due to reflection from the sky, the colour is inherent and holds true even with highly purified water. See below: the article is a little intense but these guys seem to know a little more about water than my highschool chemistry teacher.

http://www.lsbu.ac.uk/water/vibrat.html

"This absorption spectrum of water (red light absorbs 100 times more than blue light), together with the five-times greater scattering of blue light over red light, contributes to the blue color of lake, river and ocean waters. Colloidal silica may contribute to the outstanding blue color of certain, often hydrothermal, pools and lakes [372]. Ice is also blue [159] for similar reasons...."