Scientists Unlock 2,000-Year-Old Vesuvius Scrolls with Lead
Scientists have recreated carbonized papyrus scrolls and added lead to the ink, enabling X‑ray techniques to reveal text that was previously unreadable. The method could unlock many fragile scrolls from the Herculaneum library.
By Felo News Desk · Published
When Mount Vesuvius erupted in 79 CE, it buried the Roman city of Herculaneum under a thick layer of ash and rock. Among the treasures trapped in the ash were dozens of papyrus scrolls that survived the heat in a carbonized, brittle form. Today, scholars are trying to read these ancient texts, but the carbon‑rich material and the ink that once wrote on it are nearly indistinguishable. A new study shows that adding lead to the ink can give X‑ray imaging a leg up, potentially allowing researchers to recover words from scrolls that have long been considered unreadable.
Why the Scrolls Are So Hard to Read
Carbonized papyrus is a tough, blackened material that has lost the flexibility of its original fibers. When scholars try to open a scroll, the papyrus can crack or crumble. Even when the scroll is left intact, X‑ray imaging struggles because both the papyrus and the ink are made of carbon. The two materials look almost identical on scans, making it difficult to separate the writing from the background.
In recent years, scientists have combined artificial intelligence with X‑ray tomography to virtually unroll some of the scrolls. The process uses X‑ray data to build a 3‑D model of the scroll’s interior, then applies software to flatten the layers and read the text. While this method has yielded some successes, it still faces a major hurdle: distinguishing ink from the surrounding papyrus.
Lead Is the Key Ingredient
During a survey of fragments from the Herculaneum collection, researchers discovered traces of lead in some of the letters. Lead is a heavy metal that shows up distinctly on X‑ray fluorescence scans, unlike carbon. The team hypothesized that if the ink contained lead, X‑ray imaging could pick up the metal and use it as a marker for the text.
To test this idea, the scientists created their own papyrus scrolls. They wrote on the scrolls with inks that had different concentrations of lead, rolled them into tight scrolls, and then subjected them to a furnace that mimicked the extreme heat of the Vesuvius eruption. The result was a set of replicas that were chemically identical to the original scrolls, but with a known text embedded in the ink.
Scanning the Replicas Yields Results
The team used X‑ray fluorescence to confirm that lead was present in every replica, regardless of concentration. They then performed X‑ray tomography on the scrolls, feeding the data into a custom software program designed to separate the layers and read the text. The scans revealed that the lead helped the algorithm identify the boundaries of the letters, allowing the researchers to recover portions of the writing that would otherwise be invisible.
Douglas Seiler, one of the study’s lead authors, noted, “It’s amazing what you can get electrons to do.” The success of the experiment suggests that a similar approach could be applied to the original Herculaneum scrolls. By first screening the scrolls for lead, scholars could prioritize those that are more likely to yield readable text when virtually unrolled.
Implications for the Herculaneum Library
More than a dozen scrolls from Herculaneum have already been opened and read, revealing works by Epicurus and other ancient thinkers. However, many of the remaining scrolls are too fragile to open, and even the best X‑ray techniques have struggled with them. The lead‑ink method offers a new path forward, potentially unlocking a larger portion of the library’s contents.
Because the replicas contain known text, they can also serve as training data for machine‑learning algorithms. Researchers can fine‑tune the software to recognize patterns in the scans, improving its ability to interpret the original scrolls. This dual benefit—both a new reading method and a way to refine the technology—makes the study a significant step toward preserving and understanding ancient literature.
The research was conducted at the National Institute of Standards and Technology (NIST) and funded by the U.S. Department of Commerce’s Radiation Physics Division and the Center for Neutron Research. The findings were published in the open‑access journal PLOS One, making them freely available to scholars worldwide.
Key facts
- Lead in ink makes X‑ray imaging of carbonized scrolls more effective
- Researchers recreated scrolls with varying lead concentrations
- X‑ray fluorescence confirmed lead presence in all replicas
- Custom software successfully read text from scanned replicas
- The method could prioritize which fragile scrolls to study
- Replicas also help train AI to read real scrolls
Why it matters
By demonstrating that lead can act as a marker in carbonized scrolls, the study opens a realistic pathway to read texts that have been inaccessible for centuries, enriching our knowledge of ancient Roman literature and philosophy.
Frequently asked questions
Can this method read all Herculaneum scrolls?
It may work best on scrolls that contain lead in the ink, but not all original scrolls have been confirmed to have lead.
Will the original scrolls be damaged by X‑ray scans?
X‑ray tomography is a non‑destructive technique, so the scrolls remain intact after scanning.
Is lead safe to handle in the lab?
Yes, the researchers used controlled environments and standard safety protocols for handling lead.
Sources
- [1] scitechdaily.com — originally reported as “Mount Vesuvius Buried These Scrolls for 2,000 Years – Now Scientists May Read Them”
