Science · London, United Kingdom · October 25, 2026

Scientists rediscover how Romans made color-changing glass

Reported by 1 outlet · first reported Oct 25, 2:00 AM ET

Scientists said they have rediscovered how Romans made color-changing glass like the 1,600-year-old Lycurgus Cup. The cup, held at the British Museum, changes color depending on where the light falls. Its optical engineering had puzzled experts for centuries.

Why it matters

Recovering the method solves a long-standing mystery about ancient technology.

Background

The Lycurgus Cup is one of the best-known surviving works of Roman glass. It shows a scene from Greek myth.

Sources

• Guardian Science ↗Oct 25, 2:00 AM ET

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