It is the whitest substance known in that its albedo is uniformly high across the whole spectrum (reflecting all electromagnetic radiation with equal vigor), however, it absorbs IR like nothing else known (and so is a perfect blackbody. Its plausible that I could be wrong on all that (considering that I'm self taught on all that). But that notwithstanding, water is some pretty wonderfully facinating stuff.
E.g. if but for that little density hook thing, no life on this planet could exist (all the lakes would freeze solid ffom bottom up). I'm certain this would cause no shortage of consternation to would-be ice fisherman.
..and the only substance which increases in volume when it freezes.
In addition to its characteristics as ice, it also has some uniques qualities in the high temperature ranges also.
But snow flakes are always white so Al Sharpton is threatening to sue.