in news:web.3f421f33fc5ecef17cd558720@news.povray.org lars.gregersen 
wrote:

> I would like the zero concentration areas to be shown as clear water
> (obviously) and the concentration as varying colours.

Turn your concentration measurements into a density (df3) file. Use this 
file in combination with media and a colour_map.

6.7.11.11  Density_File

and

6.8.3  Density

Ingo

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