‘It’s magic’: scientists rediscover how to make ancient Roman colour-changing glass

Exclusive: Optical engineering that went into 1,600-year-old Lycurgus Cup has baffled experts for centuries The Romans’ proficiency in the art of glass-making has produced some of the wonders of antiquity, but few of their creations better a 1,600-year-old masterpiece which sits in the British Museum.

Depending on where a light source is positioned, the Lycurgus Cup changes colour, from jade green under normal…