I'm still not convinced. The absorbance of water is not really relevant to clouds. My principal source on this matter is the excellent book Color and Light in Nature, by David K Lynch and William Livingston. They explain why clouds are white as follows: "because practically no light is absorbed and all colors are scattered equally." They go on to remark that while water has a faint bluish colour, this hue plays no role in a cloud because the light travels only small distances through water droplets when it passes through a cloud.

Of course, I'm no more an expert in these matters than you are.

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