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

<p>Exclusive: Optical engineering that went into 1,600-year-old Lycurgus Cup has baffled experts for centuries</p><p>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 whic