On 11-2-2016 13:45, Sven Littkowski wrote:
> Thanks. There are two keywords in it, which will help me now to
> investigate better: scattering and absorption.
>

With scattering you might also need to scatter a reddish/orange colour 
to get blue. I think I was wrong in my previous post.

Good starting point for air and water are - as always:

http://www.f-lohmueller.de/pov_tut/
http://www.imagico.de/pov/water/water04.php

-- 
Thomas

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