My previous render finally finished and now I could make a new SSS test, 
this time with textures. The edges between red and white are actually 
completely sharp. It's the fact that the light enters the object that we 
can see some smooth edges. My trick was to use multiple media statements: 
one with scattering media (type 5, eccentricity -0.2) with extinction 
turned off, the other with simple absorption media. I'll make the source 
available if I can clean it up some more.

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