Scientists Burn Replica Scrolls to Decode Ancient Herculaneum Texts

Researchers have demonstrated a breakthrough method for reading two-thousand-year-old carbonized scrolls without physically unrolling them, a development poised to accelerate the recovery of lost ancient texts. Published Sept. 16 in PLOS ONE, the study reveals that ancient inks containing trace lead produce significantly higher contrast in X-ray computed tomography scans, enabling digital unrolling algorithms to decipher hidden text on fragile papyrus. Led by Douglas Seiler alongside collaborators from the University of Kentucky, the National Institute of Standards and Technology, and European institutions, the team manufactured modern papyrus scrolls using traditional materials. Inks were spiked with calibrated lead concentrations, then carbonized in a controlled furnace to replicate the conditions that buried the Herculaneum library during the A.D. 79 eruption of Mount Vesuvius. High-resolution X-ray scanning confirmed that lead absorbed up to 25 times more radiation than charred papyrus, rendering characters distinctly visible. A handheld X-ray fluorescence scanner was also validated as a rapid screening tool to identify optimal scrolls before complex imaging. This approach addresses a persistent bottleneck in papyrology. Since their 1752 discovery, physical unrolling of the Herculaneum scrolls has consistently caused structural collapse. The current standard relies on micro-CT paired with machine learning to detect subtle density variations between carbon ink and carbonized paper. While the Vesuvius Challenge has recently utilized AI to decipher portions of three carbonized scrolls, the signal remains extremely faint. Integrating lead detection dramatically amplifies this signal, reducing reliance on computationally intensive texture analysis and increasing reading accuracy. The methodology also enables safe algorithm development. By training virtual unrolling software on model scrolls, researchers can refine code to accommodate uneven thickness and degradation without risking irreplaceable artifacts. NIST physicists successfully adapted existing scanning algorithms to map the carbonized layers, yielding clear digital text representations. Over one thousand eight hundred carbonized scrolls from the Villa of the Papyri remain housed across Italy, France, and England. Preliminary analyses suggest leaded inks were more common than previously assumed, increasing the likelihood that numerous scrolls will yield readable content. Integrating elemental screening, high-resolution tomography, and adaptive AI establishes a scalable pipeline for ancient text recovery. Identifying leaded ink could shift the field from speculative decoding to systematic extraction, potentially unlocking a substantial fraction of the preserved library and transforming how scholars approach carbonized manuscripts worldwide.