Ancient Egyptian Materials Decoded via Proteomics

Proteomics is revolutionizing the study of ancient Egyptian materials, allowing scientists to identify the composition of paints, binders, and adhesives without harming fragile artifacts. Historically, determining the precise makeup of these substances required destructive sampling, which posed a significant risk to valuable historical objects. However, the advent of non-destructive analytical methods has provided a safer pathway to uncovering the secrets of ancient craftsmanship, directly supporting modern conservation strategies.

A recent study published in Science Advances utilized mass spectrometry-based proteomics to examine glues and adhesives across a wide array of Egyptian relics. The analysis confirmed the presence of anticipated organic sources, including animal collagens and egg proteins. Surprisingly, the researchers also identified plant-derived proteins, specifically from sesame and drumstick tree (moringa) cereals, expanding our understanding of the botanical resources utilized in antiquity.

The visual style of ancient Egypt was highly formalized, prompting intense scholarly interest in the specific pigments and techniques employed by artists. Common colorants included hematite and realgar for red hues, goethite and orpiment for yellow, and carbon-based compounds for black. White tones were achieved using calcite, gypsum, anhydrite, and huntite. Blue and green shades relied on distinct formulations, most notably Egyptian blue and Egyptian green. In a notable breakthrough last year, researchers at Washington State University successfully recreated Egyptian blue by combining silicon dioxide, copper, calcium, and sodium carbonate. They heated this mixture at temperatures comparable to those found in ancient kilns, demonstrating how elemental proportions could be manipulated to achieve specific chromatic results.

Identifying these pigments often relies on their unique elemental signatures, which can be detected through X-ray fluorescence imaging. Techniques such as macro-XRF, when combined with hyperspectral imaging, have proven effective in analyzing complex artworks. For instance, this method was previously applied to a second-century CE Greco-Roman painted funerary portrait and used to detect residual colors on marble structures at Delphi in Greece. More recently, in 2023, scientists deployed portable MA-XRF devices to investigate ancient Egyptian paintings within tomb chapels in the Theban Necropolis, further highlighting the growing role of advanced imaging in archaeological research.