Water is actually transparent. But it seems green or blue either because of what's in it, or because of what it's reflecting.
Water is actualy slightly blue, but you need an awful lot of it and an absence of sky to see that it is slightly blue. Even water molecules would be able to absorb some of the spectrum, so it should have a colour... it's just very faint.
Nate
06-29-2006 11:09 PM
Glass is green due to impurities in it. Interesting fact: if you took the glass that fiber optics are made of and made a block thick enough to have the same clarity as a half inch thick pane of glass, it would be half a mile thick.