Researchers from the University of California, Berkeley, have developed a method to decipher carbonized ancient scrolls by detecting lead in their ink, a technique that could unlock thousands of long-lost texts from the Roman era. The study, published September 16, 2026, in the journal PLOS ONE, demonstrates that even minuscule amounts of lead make inked letters readable via X-ray tomography.
Simulating the Vesuvius Cataclysm
The research was prompted by the plight of more than 1,000 papyrus scrolls from a library in Herculaneum, Italy. In 79 C.E., the eruption of Mount Vesuvius inundated the city with volcanic ash and hot gas, carbonizing the scrolls into brittle husks buried under 20 to 21 meters of rock and ash. While discovered in 1752, early attempts to physically unroll the scrolls often resulted in the material crumbling into black dust, leading Italian authorities to halt such efforts.
To test a new recovery method, Douglas Seiler, a retired inventor and affiliate of UC Berkeley, recreated the carbonization process. Seiler sourced traditional lampblack ink from Japan, papyrus, and reed pens from Egypt. He hired high school students to inscribe the papyrus with a variety of texts, including the Bible, lines from Star Wars, and a quote from the 1960s sci-fi show The Outer Limits. These replicas were then rolled and placed in a high-temperature furnace to simulate the roasting the ancient scrolls endured.
The Role of Lead in X-Ray Detection
Standard X-ray computed tomography (CT) often struggles to distinguish ink from papyrus because both are carbon-based materials. Seiler hypothesized that if the ink contained lead, it would stand out more clearly during scans. According to the study, lead absorbs up to 25 times the X-rays absorbed by the charred papyrus, making the letters highly visible.
The team utilized the Neutron and X-ray Tomography system at the US National Institute of Standards and Technology to create 3D renderings of the burned replicas by scanning them in thousands of “slices.” To read the text, the researchers used a custom version of a program originally designed to unroll scans of thin films inside lithium-ion batteries. The team also found that an inexpensive handheld X-ray fluorescence scanner could easily detect leaded ink, offering a simple way to screen which ancient scrolls should be prioritized for expensive X-ray CT scanning.
Implications for Ancient Literature
The Herculaneum collection is the only known intact library from antiquity. While most of the scrolls remain unread, those that have been physically unrolled revealed unknown works by the Epicurean philosopher Philodemus. More recently, the Vesuvius Challenge—a global competition utilizing machine learning and computer vision—successfully deciphered a full scroll in June 2026. That specific scroll, PHerc. 1667, contained 22 columns of Greek text appearing to be a Stoic philosophical treatise on ethics and human nature.
The UC Berkeley team’s findings suggest a new pipeline for recovery: first screening scrolls for lead and then virtually unrolling those that test positive. Because the researchers already know the text on their replicas, these scrolls also serve as a reference to train algorithms to interpret scans more accurately. This effort aims to recover lost works of science, philosophy, and literature that were otherwise destined to remain unreadable.
Comparison of Recovery Methods
| Method | Process | Primary Challenge |
|---|---|---|
| Physical Unrolling | Manual opening of scrolls | Material crumbles into ash |
| Standard X-ray CT | 3D imaging of internal structure | Difficulty distinguishing carbon ink from carbon papyrus |
| Lead-Detection CT | X-ray tomography targeting lead elements | Requires ink to contain lead concentrations |