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Scientists solve the color-changing mystery of the Lycurgus cup

So, British scientists have shed new light on the remarkable colors of the late antique Lycurgus cup. This Roman glass vessel can look green in reflected light and red when light shines through it. The effect comes from tiny gold and silver particles embedded in the glass, which interact with light in unusual ways. It’s a striking example of how ancient craftsmanship combined art and materials science.
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