Recent research at Lund University in Sweden has revealed the true colors of several marine dinosaurs. Since soft tissue usually isn’t fossilized we don’t often catch a glimpse of the colors that ancient reptiles displayed. But new techniques involving chemical traces in the rocks surrounding fossils, high-energy particles and electron microscopes have brought the prehistoric rainbow to life. Researchers studied the remains of a giant turtle, a mosasaur and an ichthyosaur and found ovoid pigments that suggest the lizards were black—perfect camouflage for the lightless depths of the ancient oceans.
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http://news.sciencemag.org/paleontology/2014/01/true-color-ancient-sea-creatures