The “Mona Lisa” has given up a secret.
FILE - Journalists walk past Leonardo da Vinci's Mona Lisa during a visit of the Louvre museum Tuesday, June 23, 2020. Using X-rays to peer into the chemical structure of a tiny speck of the celebrated work of art, scientists have gained new insight into the techniques that Leonardo da Vinci used to paint his groundbreaking portrait of the woman with the exquisitely enigmatic smile.
“He was someone who loved to experiment, and each of his paintings is completely different technically,” said Victor Gonzalez, the study's lead author and a chemist at France’s top research body, the CNRS. Gonzalez has studied the chemical compositions of dozens of works by Leonardo, Rembrandt and other artists.
Finding plumbonacrite in the “Mona Lisa” attests “to Leonardo’s spirit of passionate and constant experimentation as a painter – it is what renders him timeless and modern,” Bambach said by email. “Plumbonacrite is really a fingerprint of his recipe," Gonzalez said. “It's the first time we can actually chemically confirm it.”
Leonardo is thought to have dissolved lead oxide powder, which has an orange color, in linseed or walnut oil by heating the mixture to make a thicker, faster-drying paste.
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