Blackley's Ancient Egyptian.

Sourdough yeast doesn't die quickly. In the absence of food, it goes dormant — a biological pause state that can last, apparently, for an extraordinarily long time if the conditions are right. Dry, cool, sealed inside the pores of ancient clay. The ancient Egyptians couldn't have known this. They were just using pots.

In the spring of 2019, Seamus Blackley — a particle physicist, video game pioneer, and dedicated amateur baker — began to wonder whether the yeast dormant in ancient Egyptian bread-making and beer-making pottery might still be viable. He had been making sourdough from modern wild-caught starters, but he was drawn to the idea of reaching further back. He made some calls. He found an archaeologist who could read hieroglyphs. He found a microbiologist who could culture ancient organisms. And he found two museums willing to let him collect samples from 4,500-year-old pots in their basements.

This project happened because three very specific people existed at the same time and were willing to work together on something genuinely weird. Here is who they are.

The collection happened over several visits. Blackley and his colleagues went to Harvard's Peabody Museum of Archaeology and Ethnology in Cambridge and the Museum of Fine Arts in Boston, both of which hold collections of ancient Egyptian pottery including vessels specifically used in bread and beer production.

The extraction method involved pumping liquid into the clay — in a process Blackley described as similar to fracking — and pulling out the microorganisms trapped in the pottery's pores. The work was done with masks, gloves, and sterile technique to minimize contamination. Nearly all the samples were sent directly to Bowman's lab for analysis. Blackley secretly kept one.

The first attempt to culture the ancient yeast failed. Modern growth media — the nutrient broths used in standard microbiology labs — killed whatever was there. This, counterintuitively, was a hopeful sign: it suggested the organisms were genuinely ancient and unfamiliar with modern inputs. Blackley tried again with Emmer wheat, a grain that predates modern wheat varieties and is closely related to what ancient Egyptians would have used. The Emmer worked. The yeast woke up.

Blackley baked his first loaf in August 2019. He used the ancient yeast as the leavening agent, combined with more Emmer wheat flour, water, and unfiltered olive oil — ingredients chosen to match what ancient Egyptians would have used. He photographed every step and posted it on Twitter in real time. The result, he reported, was extraordinary.

"The aroma of this yeast is unlike anything I've experienced," he wrote. "The crumb is light and airy. It's much sweeter and more rich than the sourdough we are used to." He was, by his own account, emotional.

The story didn't end there. Over the following year, Blackley went further — deeper into historical accuracy. He learned from Dr. Love that ancient Egyptians didn't bake in modern ovens. They used conical clay vessels called bedja, placed over embers or into holes in the ground. Blackley built his own replica bedja. He dug a hole. He baked bread in it. The result, he reported, worked remarkably well.

Blackley's ancient Egyptian starter is not publicly available. There is no carlsfriends.net equivalent, no Etsy listing, no bakery selling bread made from it. The starter remains in Blackley's possession and in Bowman's lab. Several people report having received samples through sourdough community contacts and baking classes, but there is no official distribution channel.

If this changes, we'll update this page. In the meantime: the story exists, the science exists, and the bread apparently tasted extraordinary. Sometimes that's enough.

If what draws you to this entry is the idea of a starter with deep archaeological roots, there are two practical alternatives worth knowing about. The Carl Griffith 1847 Oregon Trail Starter (Specimen № 0142) is free and genuinely old. For something with even more ancient credentials and actual commercial availability, the Bavarian "Black Death" Sourdough — a starter with oral history dating to the 1633 plague in Oberammergau, Germany — is available on Etsy from a small number of sellers who maintain the culture.