Fun facts:
Water ice doesn't absorb a lot of light in the visible; pure water ice is almost entirely transparent, although with slightly stronger absorption in the red (hence why very large amounts of mostly pure ice, such as glacial ice, has blue shading). What makes water ice much more visible comes from light scattering off impurities, air bubbles, or cracks (e.g. why ice cubes are sometimes clear and sometimes white, despite both being water ice).
It gets more interesting in the near-ultraviolet; between 200 and 400 nm, water ice is so transparent that we literally cannot measure the amount of light it absorbs. Even using deep boreholes in ultra-pure Antarctic ice, any loss of transparency is apparently dominated by scattering off impurities at levels of parts-per-billion. At the wavelength where absorption is lowest (~390 nm), our best estimate is that the mean free path of a photon in pure ice is over a kilometer; this makes water ice in the near-UV the most transparent solid known.
