What would be the color of the sea without an atmosphere?

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SUMMARY

The color of the sea on Earth without an atmosphere would primarily appear blue-green due to the wavelengths of light that propagate best through water. In the absence of atmospheric interference, the sea would appear black at depth, as light can only reflect from a limited distance. Near the shore, the water would be clear enough to see the ground beneath. This conclusion is supported by the behavior of pure white light sources, such as halogen lights, which maintain a teal tinge at depths where sunlight does not penetrate.

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what will be the colour appearance of the sea on earth?
 
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The sea would evaporate

But if you mean the sky was clear instead of blue, then I would imagine the sea to appear black since light can only reflect from so far down. It would be clear towards the shore (you would see the ground under the water).

Just my opinion.
 
I think that it would still be primarily blue-green, since those are the wavelengths that propagate best through water. If you take a pure white (halogen, for instance) light source to a depth where sunlight doesn't exist, things are going to have that teal tinge. The situation shouldn't change just because of a lack of atmosphere, since at depth it's irrelevant. As whozum said, however, that's just my opinion.
 

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