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X-ray Uncovers Hidden Portrait Beneath Famed Degas Painting

The technique was so successful that the scientists could not only see the details of the entire hidden image, but its evolution

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    This undated copy photo provided by Australian Synchrotron and the National Gallery of Victoria shows Edgar Degas' Portrait of a Woman. Staff at the National Gallery of Victoria in Melbourne asked scientists from Australian Synchrotron to scan the painting with a high-definition X-ray beam produced by a particle accelerator called a synchrotron to unveil the image.

    A powerful X-ray technique has unveiled a hidden portrait beneath a famed painting by French impressionist artist Edgar Degas, helping solve a mystery that has stumped the art world for decades.

    An article published this week in the online journal Scientific Reports reveals that the long-puzzled-over image concealed behind Degas' "Portrait of a Woman" is, in fact, a portrait of another woman. Australian researchers believe she is Emma Dobigny, one of the painter's favorite models.

    For nearly a century, experts have known that Degas painted the famed portrait over another image sometime between 1876 and 1880. As the painting aged, the faint outline of what appeared to be another woman began leaking through the top layers of paint.

    Staff at the National Gallery of Victoria in Melbourne, where the portrait is housed, wanted to see what was hidden underneath. But traditional X-ray techniques and infrared photography weren't powerful enough to reveal any detail.

    So the gallery teamed up with scientists from Australian Synchrotron, who spent 33 hours painstakingly scanning the painting with a high-definition X-ray beam produced by a particle accelerator called a synchrotron. Synchrotrons accelerate electrons to high speeds, creating a source of light a million times brighter than the sun.

    The technique was so successful that the scientists could not only see the details of the entire hidden image, but its evolution. Degas, for example, appears to have originally given the woman pixie-like ears, but later reworked them to a more conventional shape.

    The quality of the results stunned the scientists.

    "We were expecting to image a woman beneath, but nowhere near the detail that we did get in the end," said Daryl Howard, a scientist at Australian Synchrotron and one of the paper's authors.

    Howard is among those who believe the image is of Dobigny, a well-known French model in the 1800s.

    "Degas has painted her several times before," he said. "Some other people think it's someone else and we'll leave that for them to ultimately decide who it is."

    It was not uncommon for artists to paint over their previous work in the 1800s and Howard believes the X-ray technique used to solve the Degas portrait puzzle will be picked up by other museums wondering what lies beneath their paintings.

    "I think in the near future we're going to see a lot more of these results coming out," he said.