OK, I managed to DL the files and solve the problem: the back part of the card
had its diffuse set to 0.
This meant the color of the surface was calculated only using the ambient value.
Sth. like finish {ambient 0.2 diffuse 0.6} might be a good value (I suggest you
also use sth. similar for the front part, the ambient seemed a bit too high
there, too)

Margus

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