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Image Credit: Zuchtriegel, G. et al. 2024 / Parco Archeologico di Pompei
Blue Pigment in Pompeii Cost Nearly the Annual Pay of a Roman Soldier
A new scientific study has revealed the extraordinary cost of decorating a small room in a Pompeii house with Egyptian blue—the most prized synthetic pigment of antiquity. Researchers estimate that the pigment alone may have cost nearly the equivalent of a Roman legionary’s yearly salary.
The research, published in npj Heritage Science, focused on a small sanctuary room known as the “Blue Room” in Regio IX of Pompeii. Although the space measures only about nine square meters, its walls are covered with an unusually large quantity of Egyptian blue pigment.
Using non-invasive imaging methods and advanced chemical analysis, scientists determined that between 2.7 and 4.9 kilograms of Egyptian blue were used to paint the room. Based on ancient price records, this amount of pigment would have cost approximately 93 to 168 denarii.
To put that value into perspective, a Roman soldier in the first century earned about 187 denarii per year. This means the blue pigment used in the room’s decoration represented between half and almost the entire annual salary of a legionary.
The room has been identified as a domestic sanctuary (sacrarium) within a wealthy Roman house. Excavations revealed that at the time of the eruption of Mount Vesuvius in AD 79, the room was being used for storage. Archaeologists found amphorae, building materials and oyster shells inside, despite the luxurious decoration.
The paintings belong to the Fourth Style of Roman wall painting, characterized by elaborate decorative compositions. Against the blue background appear red niches that likely held offerings, along with painted figures representing the seasons and symbols of agricultural prosperity. Decorative motifs also include candelabra, sphinxes and winged griffins.
Egyptian blue itself was the first synthetic pigment ever produced, created by heating a mixture of sand, copper minerals, calcium compounds and alkaline materials at high temperatures. The resulting compound, known as cuprorivaite, produced a vivid blue color associated with divinity, royalty and prestige.
The pigment’s high cost meant it was typically reserved for elite contexts. In the Pompeian sanctuary, artists used it extensively across entire walls rather than limiting it to small decorative elements, emphasizing the wealth and social standing of the house’s owners.
By combining archaeological evidence with modern materials science, the study provides new insight into the economic value of luxury materials in the Roman world and the artistic choices used by Pompeii’s elite to display status and cultural refinement.
Published on: 07-03-2026
Edited by: Abdulmnam Samakie
Source: LBV Magazine