The artist was commissioned a fresco in the cathedral, but Da Vinci, who adored experiments, chose to go the other way. He chose not to paint on wet plaster, as the technique of creating frescoes required, and invented his own method by covering a stone wall with a layer of resin, gypsum, and mastic. Alas, the experiment was a failure. As a result, the religious subject of Christ’s communion with the disciples on the eve of the crucifixion eventually became a real disaster for restorers. Today, the work of Leonardo da Vinci contains about 20 percent of the original.
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