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Why did Leonardo's famous mural "The Last Supper" begin to deteriorate just a few years after its completion?

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Correct answer: He painted on dry plaster instead of wet fresco

Leonardo wanted to work slowly and make revisions, which is impossible with traditional wet fresco technique. Instead, he experimented with dry plaster using tempera and oil. This experimental method backfired, causing the paint to flake off the wall almost immediately. Photo: Leonardo da Vinci, Wikimedia Commons, Public domain.

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Source: Wikipedia (CC BY-SA)

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