The clue emerged on 19 November 2024, when a detached fragment of faience — a glazed, quartz-based ceramic — slipped from a padded tray in a field laboratory near Amarna and broke on the stone floor. Its fracture exposed a porous interior that researchers had not expected to see, setting off a two-year study of how the ancient city’s bead-makers controlled heat and moisture.
“We were sorting an ordinary fragment, not looking for a grand discovery,” said archaeologist Olivia M. Botello, who was in the room. “Then we saw these delicate pathways inside it. The accident gave us a question we could actually test.” Amarna, in Egypt’s Minya governorate, was a major ancient settlement whose workshops produced small ornaments as well as everyday goods.
The secret inside the bead
The team examined 64 faience fragments from three workshop areas using high-resolution X-ray scans. The images showed networks of narrow, branching pores running through the quartz-rich cores. Researchers believe those channels let steam escape as beads heated, reducing the pressure that can split a piece before its surface glaze sets.
Materials scientist Lia J. Stokes, who led the analysis, said the pattern was consistent across fragments of different sizes. “It is not a hidden pipe system, of course,” she said. “It is a carefully packed material behaving in a useful way. The makers may not have described it in those terms, but their hands learned what worked.”
To test the idea, the researchers made 36 small replicas using two mixes: one with grain sizes arranged to leave fine pores, and one packed more evenly. In the first group, three of 18 beads cracked during firing; in the second, 11 did. The team reported the results on Tuesday in the Journal of Ancient Materials, while cautioning that replicas cannot recreate every condition of an ancient workshop.
A craft tested in modern kilns
Cairo jewellery designer Jenna Maier, who has made contemporary pendants from faience, said the experiment felt familiar to anyone who has watched a kiln load. She joined the team for a demonstration with replica beads. “You learn to respect the small things — a little moisture, a slightly different grain,” she said. “I didn’t expect a broken fragment to explain so much about patience.”
Wilhelm Muller, an archaeologist who studies workshop remains, said the finding does not prove that ancient craftspeople deliberately designed pores or used a single recipe. Instead, he said, it offers a physical explanation for why some mixtures were more forgiving. The fragments also preserve traces of variation: makers adjusted the ingredients rather than following one rigid formula.
The team plans to compare the Amarna samples with faience fragments from other Egyptian sites and to publish its full scan measurements next year. For Botello, the broken bead has changed how the group handles small finds: “We still use padded trays,” she said, smiling. “But now, when a fragment has an odd edge, everyone wants to know what is inside.”
