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Why do art historians use X-rays to analyze historical paintings?

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Correct answer: To reveal hidden layers and older sketches underneath

X-rays can pass through newer layers of paint to reveal sketch outlines, alterations, or entirely different paintings hidden beneath. This helps museum experts detect clever forgeries and study the artist's original process. Photo: Robert Salmon, Wikimedia Commons, Public domain.

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Source: Wikipedia (CC BY-SA)

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