vynsane
cobalt
Pure water has an intrinsic pale blue color because it absorbs most of the red wavelengths of light, but its peak transparency is in the blue-green part of the spectrum. When observing light that’s passed through relatively deep water (tens of ft), the colors we detect are the blue wavelengths of light, which aren’t as readily absorbed as the longer wavelength colors. Red light is the first to be absorbed, then orange, yellow and green. Only the deepest blue light gets scattered back to the surface for a lake as deep as Crater Lake.
From epod.usra.edu/blog/2011/11/blue-color-of-crater-lake.html
cobalt
Pure water has an intrinsic pale blue color because it absorbs most of the red wavelengths of light, but its peak transparency is in the blue-green part of the spectrum. When observing light that’s passed through relatively deep water (tens of ft), the colors we detect are the blue wavelengths of light, which aren’t as readily absorbed as the longer wavelength colors. Red light is the first to be absorbed, then orange, yellow and green. Only the deepest blue light gets scattered back to the surface for a lake as deep as Crater Lake.
From epod.usra.edu/blog/2011/11/blue-color-of-crater-lake.html