Ancient Romans Used Nanotechnology
The Trustees of the British Museum / Art Resource, NY, Tiny Fox Lab

Ancient Roman artisans crafted a glass chalice, known as the Lycurgus Cup because it bears a scene involving King Lycurgus of Thrace, appears jade green when lit from the front but blood-red when lit from behind.Tiny Fox Lab Facts

Preview photo credit: The Trustees of the British Museum / Art Resource, NY
Source: https://www.smithsonianmag.com/history/this-1600-year-old-goblet-shows-that-the-romans-were-nanotechnology-pioneers-787224/