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A first-century Roman bronze inkwell from Conímbriga, Portugal, held a preserved ink residue that researchers describe as a mixed formulation: carbon-based black pigment, beeswax binder, and components consistent with bone black and iron-gall ink. The finding offers a rare look at one Roman ink recipe—not a universal formula for Roman writing.
What did scientists find in the Roman inkwell?
The artifact is a Biebrich-type bronze inkwell, a form the study dates to the first half of the first century CE. Found at Conímbriga, it is reported as the first documented example of this inkwell type on the Iberian Peninsula. The study appeared online on 4 November 2025 in Archaeological and Anthropological Sciences. Read the study record.
Researchers report that the inkwell itself was made from an alloy of copper, tin, and lead. In the residue, they identified primarily amorphous carbon—the disordered carbon associated with burning organic matter—and beeswax, which they interpreted as a binder. Calcite and phosphate groups were consistent with bone black, while iron was interpreted as evidence of iron-gall components.
A December 2025 Chemistry World report describes the ingredient attributions in more detail as ash from pine and fir, animal-bone charcoal, and iron compounds associated with oak galls. The study’s abstract uses more cautious terms: amorphous carbon, minerals consistent with bone black, and iron-gall components. Read the Chemistry World report.
Did Roman ink contain iron gall?
This particular Conímbriga residue showed iron interpreted by the study’s authors as evidence of iron-gall components. That supports the presence of iron-gall material in this sample; it does not show that all Roman ink contained it, or establish exactly how much was present.
Iron alone would not identify an ink recipe. The study’s interpretation draws on multiple kinds of evidence, and the authors distinguish the ink’s likely ingredients from the composition of the bronze container and possible changes to the residue over time.
How did the researchers analyze the residue?
The team combined elemental measurements with methods designed to characterize organic and inorganic materials. These included X-ray fluorescence and scanning electron microscopy with energy-dispersive spectroscopy, as well as chromatography, nuclear magnetic resonance, analytical pyrolysis, Fourier-transform infrared spectroscopy, and Raman spectroscopy.
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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →That range matters because a detected element or mineral does not, by itself, prove that it was deliberately added to the ink. Researchers have to consider whether a signal reflects an original ingredient, the container, or changes that occurred during burial and preservation.
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Was this the standard Roman ink recipe?
No. The Conímbriga find is direct evidence for a particular preserved formulation in one artifact. It does not establish a single recipe used throughout the Roman world, where inks could vary by place, period, writing materials, and preparation.
A separate study published in 2021 examined dry black ink powder from another first-century Roman bronze inkwell. It reported primarily amorphous carbon and Arabic gum, rather than the beeswax binder identified at Conímbriga. That study also found minerals and metal compounds that could have come from burial soil or degradation of the bronze container, underscoring why residue findings need careful interpretation. The artifacts are distinct and their results should not be combined into one recipe. Read the 2021 study.
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Other ancient ink evidence is different again. A 2020 study of Roman-period Egyptian papyri reported lead compounds in both red and black inks and suggested that lead acted as a drier rather than a pigment in those samples. That finding provides context for ink diversity; it is not evidence that lead was an ingredient in the Conímbriga ink. Read the PNAS study.
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Why does the Conímbriga discovery matter?
The study contributes archaeological evidence to questions about the chronology, variety, and transmission of ink technologies in the Roman world. The preserved residue allows researchers to investigate a specific formulation rather than infer ingredients from written descriptions alone. The inkwell also extends the known distribution of a rare type to the Iberian Peninsula.
Its strongest implication is specific: Roman ink could be chemically more varied than a simple carbon pigment-and-binder description suggests. The sample’s mixed signals—and the need to distinguish recipe from container and burial effects—also show why ancient ink is best understood through complementary analyses and artifact-by-artifact comparisons.
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