Ancient glass turns into photon crystals. Scientists at last understood, why

Analysis microscopic structure of an ancient splinter of the Roman glasses showed how photon crystals are formed, and is able to afford them to grow up. The Roman glass, buried for 2000, slowly turns in the odd person of a crystal. It wonderfully refracts light, and scientists at last understood, why. This type of glasses, used in jugs for water or wine storage, often differs a thin patina of being poured gold, blue, green and orange color which flickers on its surface. Having analysed a microstructure of a splinter of the Roman glasses, scientists found...