Analysis of Herculaneum papyrus scroll fragments reveals the use of metallic ink in Greco-Roman literary inscription centuries earlier than previously thought, according to a study*. Scholars of ancient scrolls hold that texts from antiquity, particularly Greek and Latin literary manuscripts produced until the fourth century AD, were largely written in carbon-based ink on papyri, the fibrous structure of which allowed scribes to jettison ruling lines. Vito Mocella and colleagues used nondestructive synchrotron X-ray-based methods to chemically analyze the barely visible black inscriptions on two nearly flat, multilayered papyrus fragments that were found at the Villa dei Papiri at Herculaneum in...