Researchers relied on synchrotron X-ray based techniques at the European Synchrotron Radiation Facility in Grenoble, France that revealed a high concentration of lead was used in the ink on some of the ancient scrolls. Vito Mocella, a physicist with the National Research Council’s Institute for Microelectronics and Microsystems (CNR-IMM) in Naples, told Discovery News, “We are reasonably certain t