Mona Lisa Ground Layer given the Scientific Treatment

October 12 2023

Image of Mona Lisa Ground Layer given the Scientific Treatment

Picture: pubs.acs.org

Posted by Adam Busiakiewicz:

There have been a few articles floating around this week regarding an article published in the Journal of the American Chemical Society. The research paper focuses on some new analysis of the materials used in Leonardo da Vinci's Mona Lisa, suggesting that 'a rare compound, plumbonacrite' was found in its ground layer. Its authors suggest that the artist had been experimenting whilst preparing this iconic portrait (I suppose the easier question should be, what did Leonardo not do during his lifetime).

Here's the abstract, in case any one would like to delve further:

An exceptional microsample from the ground layer of Leonardo da Vinci’s Mona Lisa was analyzed by high-angular resolution synchrotron X-ray diffraction and micro Fourier transform infrared spectroscopy, revealing a singular mixture of strongly saponified oil with high lead content and a cerussite (PbCO3)-depleted lead white pigment. The most remarkable signature in the sample is the presence of plumbonacrite (Pb5(CO3)3O(OH)2), a rare compound that is stable only in an alkaline environment. Leonardo probably endeavored to prepare a thick paint suitable for covering the wooden panel of the Mona Lisa by treating the oil with a high load of lead II oxide, PbO. The review of Leonardo’s manuscripts (original and latter translation) to track the mention of PbO gives ambiguous information. Conversely, the analysis of fragments from the Last Supper confirms that not only PbO was part of Leonardo’s palette, through the detection of both litharge (α-PbO) and massicot (β-PbO) but also plumbonacrite and shannonite (Pb2OCO3), the latter phase being detected for the first time in a historical painting.

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