For more than a century, a mystery has surrounded the alabaster jars found in King Tut’s tomb. Carved from Egyptian calcite and still stained with dark, sticky residues, the vessels have long posed a simple but unanswered question: what, exactly, did they once hold?
Now, a new study led by researchers from Yale University suggests that the answer may lie not in perfume or ritual oils, but in something far more potent.
Using advanced chemical techniques, researchers report some of the clearest evidence yet that the ancient Egyptian alabaster vessels were used to store opium—potentially rewriting long-standing assumptions about drug use in the ancient world.
“Our findings combined with prior research indicate that opium use was more than accidental or sporadic in ancient Egyptian cultures and surrounding lands and was, to some degree, a fixture of daily life,” lead author and a research scientist at the Yale Peabody Museum, Dr. Andrew J. Koh, said in a press release. “We think it’s possible, if not probable, that alabaster jars found in King Tut’s tomb contained opium as part of an ancient tradition of opiate use that we are only now beginning to understand.”
The research, published in the Journal of Eastern Mediterranean Archaeology and Heritage Studies, focuses on a rare Egyptian alabastron housed in Yale’s Babylonian Collection.
Inscribed in four ancient languages and dating to the Achaemenid period (486-465 BCE), the vessel offered researchers a unique opportunity to directly link chemical evidence to historical context. What they found inside may help illuminate not only this jar’s past, but also the purpose of similar vessels buried alongside Egypt’s most famous pharaoh.
The research focused on organic residue analysis, a technique that allows scientists to extract and identify microscopic traces of ancient substances absorbed into a vessel’s material.
By applying gas chromatography–mass spectrometry to samples taken from the Yale alabastron, the team detected a suite of chemical compounds that together form a clear molecular fingerprint of opium.
“Extractions definitively show evidence for noscapine, hydrocotarnine, morphine, thebaine, and papaverine, well-known diagnostic biomarkers for opium,” researchers write.
The compounds are the chemical hallmarks of Papaver somniferum, the opium poppy, and their presence inside an inscribed Egyptian alabaster vessel represents a milestone for Egyptian archaeology.
According to researchers, this marks “the first time that the contents of an inscribed Egyptian alabastron have been identified through scientific techniques.”
Egyptian alabaster vessels appear across the ancient Mediterranean and Near East, often in elite or royal contexts. Yet for decades, scholars largely defaulted to the assumption that they contained perfumes, cosmetics, or ritual unguents—ideas shaped as much by modern expectations as by hard evidence.
Earlier chemical studies, including pioneering work conducted in the 1930s, failed to identify aromatic compounds but lacked the analytical sensitivity to detect other compounds.
The new findings challenge previous assumptions. The opium biomarkers detected in the vessel closely match chemical signatures previously identified in Cypriot Base Ring juglets—small pottery vessels long suspected, and now confirmed, to have contained opium.
The parallel suggests that alabaster vessels may have served a similar role, acting as high-status containers for psychoactive substances that moved along elite trade and gift-exchange networks.
The study also revisits archaeological evidence from Sedment, Egypt, where alabaster vessels and opium-linked juglets were found together in New Kingdom tombs. The chemical “echo” between those earlier finds and the Yale alabastron points to continuity in both substance and practice across centuries.
This continuity brings new attention to one of archaeology’s most famous unsolved puzzles: the alabaster jars found in King Tut’s tomb.
Howard Carter, the British archaeologist who uncovered King Tut’s tomb in 1922, documented dozens of calcite vessels, many of them still coated with dark, sticky residues that gave off a distinct odor.
At the time, chemist Alfred Lucas ruled out perfumes and many common unguents but could not chemically identify the material. As a result, the contents of these vessels remained officially uncertain for decades.
The Yale-led study invites a reassessment. Researchers note that the residues in King Tut’s jars closely resemble the physical characteristics of dried opium latex and that ancient looters appeared to have targeted these vessels with unusual care, scraping their interiors down to the last traces. Such effort, the researchers argue, makes more sense if the contents were pharmacologically valuable rather than merely cosmetic.
“It remains imminently possible, if not probable, based on a reassessment of KV62 with new evidence presented by this current study that at least some of the vast remaining bulk of calcite vessels, which Lucas would not even hazard a guess as to their contents publicly and categorized officially as uncertain, in fact contained opiates as a part of a long-lived ancient Egyptian tradition,” researchers write.
These findings reshape historians’ understanding of daily life and medicine in antiquity. Opiates were not fringe substances reserved for rare rituals, the evidence suggests, but integrated into medical, social, and even funerary practices across social strata. The presence of opium residues in both elite and non-elite burial contexts points to a substance that was culturally embedded rather than taboo.
The research also highlights the importance of material choice. Calcite, the stone used to make Egyptian alabaster, turns out to be unusually effective at preserving organic compounds over millennia.
Its chemical properties may explain why these vessels retained detectable opium residues when ceramic containers often do not—a discovery that could guide future archaeological investigations.
Instead of treating ancient vessels as inert art objects, researchers examined them as functional technologies designed to store, preserve, and signal specific substances. In that sense, alabaster jars may have functioned as recognizable markers of opiate use, much as particular forms of paraphernalia signal drug consumption today.
“Scholars tend to study and admire ancient vessels for their aesthetic qualities, but our program focuses on how they were used and the organic substances they contained, knowledge that reveals a great deal of information about the daily lives of ancient peoples, included what they ate, the medicines they used, and how they spent their leisure time,” Dr. Koh explains.
Ultimately, researchers do not claim to solve every mystery surrounding King Tut’s jars. However, they do provide the strongest empirical case yet that at least some of those enigmatic vessels once held opium.
The researchers argue that understanding these ancient practices has modern relevance as well.
“Considering a global opioid crisis reverberating across the world today, understanding the detailed nuances of the role that opiates played in antiquity could help us better tackle the complexities of our own modern interactions with opioids,” the researchers write.
“By accessing both legacy collections and more recently excavated material at scale and connected with their contexts, past and present, we now stand at the threshold of completely reimagining the nature of ancient pharmacology and medical practices through fresh, transdisciplinary approaches that also hold promise for better understanding our own world today,” they conclude.
Koh and his colleagues’ recent study, “The Pharmacopeia of Ancient Egyptian Alabaster Vessels: A Transdisciplinary Approach with Legacy Artifacts,” appeared in the Journal of Eastern Mediterranean Archaeology and Heritage Studies.
Tim McMillan is a retired law enforcement executive, investigative reporter and co-founder of The Debrief. His writing typically focuses on defense, national security, the Intelligence Community and topics related to psychology. You can follow Tim on Twitter: @LtTimMcMillan. Tim can be reached by email: tim@thedebrief.org or through encrypted email: LtTimMcMillan@protonmail.com