Light and color physics are well understood

But making sense of the evidence requires careful examination of the fossil and a good understanding of the physics of light and color.First of all, here's what we actually see on the fossil:imprints of bones and feathers that have left telltale mineral deposits.And from those imprints,
we can determine that these microraptor feathers were similar to modern dinosaur,as in bird, feathers.But what gives birds their signature
diverse colorations?