The 'Nude Mona Lisa', a
charcoal drawing made between 1485 and 1538 and kept in the
Museo Condé of France's Chantilly Castle, may have been executed
by Leonardo da Vinci himself, experts now think.
In order to shed light on the mystery, the work was taken in
secret a month ago to Paris, where a group of researchers from
the Louvre are carrying out a series of tests, Le Figaro said.
The painting was acquired in 1897 by Henri d'Orleans,
Duke of Aumale, who was convinced it was painted by Leonardo.
Although the experts are still being cautious, Condé Museum
curator Mathieu Deldicque says that "the drawing is, at least in
part, the work of the master".
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