High-tech hunt underway for lost da Vinci masterpiece

High-tech hunt underway for lost da Vinci masterpiece: "If you believe, as Maurizio Seracini does, that Leonardo da Vinci’s greatest painting is hidden inside a wall in Florence’s city hall, then there are two essential techniques for finding it. As usual, Leonardo anticipated both of them.First, concentrate on scientific gadgetry. After spotting what seemed to be a clue to Leonardo’s painting left by another 16th- century artist, Seracini led an international team of scientists in mapping every millimetre of the wall and surrounding room with lasers, radar, ultraviolet light and infrared cameras. Once they identified the likely hiding place, they developed devices to detect the painting by firing neutrons into the wall.Seracini was standing in the Palazzo Vecchio’s grand ceremonial chamber, the Hall of 500, which was the centre of Renaissance politics when Leonardo and Michelangelo were commissioned to adorn it with murals of Florentine military victories.