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How did the Romans make green glass that turns translucent red?
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How did the Romans make green glass that turns translucent red?

So, the fourth-century Lycurgus Cup is a remarkable Roman glass treasure, famous for its intricate decoration and its surprising colour change. It looks green when light shines onto it, but glows red when light passes through. For years, experts suspected that traces of gold and silver in the glass caused the effect, though some thought it might have happened by chance. Now, master glassmaker Lisa Hollands has recreated the recipe, and artist Elliott Walker has used it to make a modern version of the cup.
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