Researchers say they've identified Leonardo da Vinci's left index fingerprint

Anthropologists said they have pieced together Leonardo da Vinci's left index finger print a discovery that could help shed light on such matters as the food the artist ate and whether his mother was of Arabic origin.

The reconstruction of the finger print was the result of three years of research and could help attribute disputed paintings or manuscripts, said Luigi Capasso, an anthropologist and director of the Anthropology Research Institute at Chieti University in central Italy.

"It adds the first touch of humanity. We knew how Leonardo saw the world and the future ... but who was he? This biological information is about his being human, not being a genius," Capasso said in a telephone interview.

The research was based on a first core of photographs of about 200 fingerprints most of them partial taken from about 52 papers handled by Leonardo in his life. Capasso's work, presented in 2005 in a specialized magazine called "Anthropologie" published in the Czech Republic, is on display in an exhibition in the town of Chieti through to March 30.

The artist often ate while working, and Capasso and other experts said his finger prints could include traces of saliva, blood or the food he ate the night before information that could help clear up questions about his origins.

For instance, experts determined that the finger print suggests Leonardo's mother was of "oriental origin."

"It's not like every population has typical finger prints, but they do have specific proportions among their signs. The one we found in this finger tip applies to 60 percent of the Arabic population, which suggests the possibility that his mother was of Middle-Eastern origin," Capasso said.

The idea that Leonardo's mother could have been a slave who came to Tuscany from Constantinople now Istanbul, Turkey is not new and has been the object of other research.

Alessandro Vezzosi, a Leonardo expert and the director of a museum dedicated to the artist in his hometown of Vinci, said there are documents that appear to back this up.

"This coincides with documented indications that she was oriental, at least from the Mediterranean area, not a peasant of Vinci," he said.

Vezzosi, who manages the archive of documents Capasso used for his study, warned that her origin cannot be determined with any certainty until a contract documenting her sale is found.

"Still, her name was Caterina, the most common name among slaves in Tuscany, and we have no certain elements about her," he said.

The experts say some of the fingerprints left on the manuscripts might belong to the people who handled them over time. However, those caused by attempts to remove ink blots were surely left by the author, Capasso said.

Biological information on Leonardo is largely incomplete. The artist, who was generally but not exclusively left-handed, used his fingers to paint, and his thumb print is recurring on the manuscripts, Vezzosi said.

Leonardo sometimes worked while eating or traveling, and his fingers were often dirty, sometimes with residue of food, he said.

Carlo Vecce, a professor of Italian literature at Naples' University and a leading expert on Leonardo da Vinci said the research, in which he was not involved, appears to be "founded."

"The research on Leonardo's finger prints is very interesting, it's always good to locate and distinguish these details both on the paintings and on the drawings," he said. "The fingerprints can tell us if Leonardo was there or if he intervened (on a painting), it's a hint," Vecce said, noting that a fingerprint is not enough proof to attribute a work with certainty.

Vecce, however, added that such a discovery doesn't necessarily add much to what is known about the artist.

"It give us the illusion of a contact with the genius," he said. "But the most important things about Leonardo are those that concern his intellectual activity, those that we get by reading his words or interpreting what he wrote," he said.

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