@jxjibon.base.eth

The Lycurgus Cup was made in Rome, and possibly in Alexandria itself, about 1600 years ago. And it can change color. If the artifact is illuminated with daylight from the front, it has a greenish tint, if illuminated from behind, it turns red. The dating of archaeologists is based solely on the fact that the Romans were the first to achieve top results in glass. There is no more evidence that it was created in the 4th century of our era. In the composition of 1 million glass particles, 330 silver nanoparticles and only 40 gold were added by unknown creators. The size of these particles was only 50 nanometers. Because of this, the color changes at different lighting angles. An open question: how could the Romans at the dawn of our era get nanoparticles of the right size?

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