The ice looks blue because the shorter blue lightwaves are able to penetrate the ice, whereas, the longer lightwaves of red and green are absorbed. The thicker the ice, the bluer, as you can see in these slices.
Perito Moreno slices of blue ice
Phyllis Nethercot, Nov 10-30, 2015
The ice looks blue because the shorter blue lightwaves are able to penetrate the ice, whereas, the longer lightwaves of red and green are absorbed. The thicker the ice, the bluer, as you can see in these slices.