Long before modern breweries had pumps, filters, or stainless-steel tanks, Chinese brewers were already refining their process. At the Wayaoli site in Zhejiang province, archaeologists have found evidence that people were making rice-based alcohol with red Monascus mold and separating the finished drink from grain with woven plant fiber.
The discovery comes from 16 pottery vessels dating to roughly 5,000 to 5,300 years ago. Researchers examined microscopic traces left inside the ceramics, including starch, plant remains, fungal material, and tiny fibers. Five filter vessels contained rice residues alongside Monascus, a mold still associated with traditional red-rice fermentations. The findings are detailed in the study published in Archaeological and Anthropological Sciences. The evidence for ancient red-mold brewing and cloth filtration offers a rare glimpse at the practical technology behind Neolithic alcohol.
Fermentation would have been only part of the challenge. Rice mash leaves behind a thick mixture of liquid and spent grain, so producing a smoother beverage requires some way to separate the two. The Wayaoli vessels appear to have handled that job through a two-part arrangement: a perforated or porous ceramic filter, likely supplemented by bast-fiber cloth placed across its upper surface. That textile layer could have trapped solids while allowing the alcohol to drain through more cleanly.
The role of Monascus is especially significant. The mold can help transform rice into fermentable sugars and gives the resulting drink a reddish color, suggesting that Wayaoli brewers were not simply leaving a grain mixture to ferment by chance. They appear to have used a starter culture—an early example of controlled microbial processing, even if the people making it had no concept of fungi or fermentation chemistry.
This was not an isolated development in ancient China. Chemical residues from pottery at Jiahu, a much earlier Neolithic settlement in Henan, have shown that people were producing a mixed alcoholic drink from rice, honey, and fruit as early as about 9,000 years ago. That earlier beverage is part of a long history in which Chinese brewers experimented with molds, grains, plants, and filtration rather than relying on a single standardized recipe. Research published in PNAS identified that Jiahu drink as one of the earliest known fermented beverages.
Wayaoli therefore adds a new piece to the story: not just what ancient people drank, but how deliberately they engineered the drink’s texture and clarity. The pottery and fiber traces suggest that filtration had become a planned stage of production by the Late Neolithic period. Further residue studies may reveal whether similar equipment was used elsewhere, and whether regional recipes relied on different grains, molds, or plant additives.
