Analysis of the Layers (IMAGE) European Synchrotron Radiation Facility Caption This is a representation of the superposition of layers in paintings in the face of Mona Lisa, on one light zone near the nose and the darker shadow of the hair. After treating the data, the thickness and concentration of pigments in the different layers. Credit C2RMF Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.