Photo (IMAGE) Moscow Institute of Physics and Technology Caption Left: The red circles indicate where samples were taken. The team avoided sampling from the central part of the portrait. The areas noninvasively examined via X-ray fluorescence spectroscopy are marked in white. Right: The quality of the two seams seen on the back of the painting is different Credit Nikolay Simonenko et al./Heritage Science 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.