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Ichthyosaurus (was Feathering in coelurosaurs)

>>What colors they were, or if the large
dinos were color-impaired, is at the moment beyond the reach of a direct
scientific inquiry. <<

I'd like to use this opportunity to bring up something that's been puzzling me.
Wasn't there something a while back about actualy knowing the coloration of
Ichthyosaurus.  In the book Dinosaurs and Prehistoric Animals (primarily by
Dougal Dixon) it says, "The remains of pigment cells have also been preserved
and the analysis of these suggests that the smooth, thick skin of Ichthyosaurus
was a dark reddish-brown color in life."  What ever became of that theory?  Is
it still valid?