>     Well, scattering media also absorbs the light coming from behind it. So
> my guess is that the bule is one of your white checkers as seen once the
> red has been scattered out of the way of the camera.

You're both right. Here's the text from the docs:
"The scattering effect is only visible when light is shining on the 
media from a light source. [...] In addition to reflecting light, a 
scattering media also absorbs light like an absorption media."

I just missed this last sentence when reading the docs :(

And Tim's tip (extinction 0) does work like a charm :)

Thanks for your help,
Florian

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