Inside the Forbidden ... art X-ray diffraction machine. The resulting images, projected onto computer screens, hold clues to the discoloration's origin. "We want to learn what the black material is," ...

In some of the structures, curated art and historic relics have ... Tiananmen Square, Forbidden City, Mutianyu Great Wall (1465 reviews) ...

BEIJING — It’s highly technical work in what looks more like a lab than a museum: A fragment of a glazed roof tile from Beijing’s Forbidden City is analyzed in a state-of-the-art X-ray ...