How do paleontologists determine what color a dinosaur's feathers were?

Last week, researchers studying a dinosaur named Microraptor published the results of a remarkable discovery: this small, four-winged dinosaur was covered from head-to-toe in black feathers, but shone with a glossy hint of blue. In other words, its plumage was iridescent. » 3/14/12 11:10am 3/14/12 11:10am