The Romans Called it ‘Alexandrian Glass.’ Where Was It Really From?

Glass receptacles recovered from Egypt dating to the first or second century A.D., during the Roman occupation.  Credit...Artokoloro, via Alamy

Trace quantities of isotopes hint at the true origin of a kind of glass that was highly prized in the Roman Empire.

Glass was highly valued across the Roman Empire, particularly a colorless, transparent version that resembled rock crystal. But the source of this coveted material — known as Alexandrian glass — has long remained a mystery. Now, by studying trace quantities of the element hafnium within the glass, researchers have shown that this prized commodity really did originate in ancient Egypt.

It was during the time of the Roman Empire that drinks and food were served in glass vessels for the first time on a large scale, said Patrick Degryse, an archaeometrist at KU Leuven in Belgium, who was not involved in the new study. “It was on every table,” he said. Glass was also used in windows and mosaics.

All that glass had to come from somewhere. Between the first and ninth centuries A.D., Roman glassmakers in coastal regions of Egypt and the Levant filled furnaces with sand. The enormous slabs of glass they created tipped the scales at up to nearly 20 tons. That glass was then broken up and distributed to glass workshops, where it was remelted and shaped into final products.

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