How was da Vinci?s The Last Supper created, causing the belief that the painting will be completely lost one day?

Leonardo painted The Last Supper on a dry wall rather than using the usual method of applying paint to wet plaster. This experimental technique allowed him to work slowly, but the paint did not bond well to the wall and began deteriorating and peeling soon after. So the correct choice is the one describing a version of fresco on dry plaster.

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