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Previously, using radar and X-rays, Mr. Seracini and his team found a cavity behind Vasari’s fresco that they think could indicate a space between two walls.

Florence Mayor Matteo Renzi said one plan aims to remove some parts of the Vasari fresco, which were restored in the 19th and 20th centuries, to look behind them.

“We are sure that the ‘Battle of Anghiari’ is behind [Vasari’s work],” he said.