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The excavation of several thousand life-size terracotta warriors in China has fascinated the world ever since the army was first uncovered by archaeologists in 1974. Buried in moist ground, these clay figures have remained mostly intact for over 2000 years. As soon as they are exposed to air, however, the paint on the warriors curls up and breaks into small flakes. Conservators are deeply worried.
Hinsch et al. (Thu,) studied this question.