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Search Is on for Lost Da Vinci

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Danielle Gorree
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« on: September 10, 2011, 06:32:03 pm »



Peter Paul Rubens' copy of The Battle of Anghiari. Wikimedia Commons.

Conclusive evidence would come from a special copper-crystal mosaic gamma ray diffraction lens, which can map out hidden paint pigments.

The camera is the idea of David Yoder, a photojournalist who is working on Seracini's story for National Geographic magazine (the National Geographic Society is one of the project's main funding partners).

He involved Robert Smither, a senior physicist from Argonne National Laboratory's Advanced Photon Source. Smither was already working on such a device for medical use in high-definition tumor imaging.

The camera would work by firing neutrons at the metals contained in Leonardo's pigments. The metals would give off gamma rays, which are then focused by the camera's copper crystals (used in place of lens glass).

"We conducted two weeks of testing in Frascati, at the Italian research center ENEA. We used thin layers of pigments and original bricks from the Palazzo Vecchio," Yoder told Discovery News.

NEWS: ****, Mona Lisa-Like Painting Surfaces

"The tests showed that the gamma rays from the pigments can pass through the brick wall, usually quite easily," he said.

The encouraging results suggest that Smither's technology should work well to determine what pigments are behind the wall -- if they are there.

At least $265,000 is needed to build a portable particle accelerator and a germanium crystal detector. So far a fund-raising effort has raised more than $21,000, with 34 days to go.

"We would like to bring people along for the journey to find this painting, not just hold everything for publication after the fact. If there is enough paint, I am confident that we can probably even create an image of the painting," Yoder said.

http://news.discovery.com/history/da-vinci-lost-fresco-110906.html
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