I tried some things and ended up trying it like this (simplified):
torus {
    2,0.5
    pigment{rgbt <0,0,0,1>}
    hollow
    interior{
      media{
        intervals 1
        absorption rgb<0,0.2,0>
    }
  }
}
giving me a light magenta torus.
Then I intersected the torus with 2 other rotated tori. Where only 2 tori
intersect the result is good: a somewhat deeper magenta. As soon as 3 or
more tori intersect this area becomes black while it should be just even
deeper magenta.
How can I change this? Any ideas? Thanks in advance.

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