Dinosaurs are so cool! It's amazing how they can even determine little details like that.
Not knowing anything about
those particular findings, but positive proof of coloration is usually only possible when the respective part of the fossil did
not get fossilized [= original material replaced by rock] and still shows the material's original color.
This year we have lost seven tourists already and that's more tourists dying in accidents than Icelanders...
That
proves it, you have some dark sacrificing rituals going on there!