Wuyi hongqu

What Wuyi hongqu is

Wuyi hongqu, also written Wuyi Hong Qu and called black-skin-red-koji in some papers, is a regional form of the Chinese red rice starter hongqu. A 2021 study describes Hong Qu as one of four traditional Chinese qu categories and separates Wuyi Hong Qu from Gutian Hong Qu. The name marks a regional category, not a single strain, and it does not make all red fermented rice products the same thing.

Papers describe it as a mixed starter associated with fungi of the genera Monascus and Aspergillus. That mixed character is what sets it apart in the research: a recent line of laboratory work paired Monascus purpureus with Aspergillus niger, two organisms isolated from Wuyi hongqu, to see how they behave together.

Where it comes from and what has been sampled

Fujian province is the region the research ties it to. One regional study examined 20 Wuyi Hong Qu samples collected in six Fujian cities. A separate 2025 study reports nine Wuyi hongqu samples from Fujian and Zhejiang. The two sample sets were drawn differently, so together they are not a complete map of producers and they do not fix where the name stops applying.

What laboratory studies have found

Researchers isolated putative fungi from sampled starter material and tested selected fungal strains in laboratory co-cultures. A culture-collection strain or a single isolate is not interchangeable with the starter as a whole, which is a community of organisms.

The reported pigment and citrinin outcomes varied with the fungal pairing and the laboratory setup. One paper used a double-sided Petri dish, an indirect form of co-culture, and says itself that more study is needed. Citrinin is a mycotoxin that some Monascus strains can produce; the 2025 paper reports co-culture conditions that raised Monascus pigment production while lowering citrinin in the tested pairings. Those results do not give a standard Wuyi hongqu formula and they do not guarantee the composition or safety of a finished food.

Uses

The reviewed sources associate Hong Qu with rice wine, and the comparison of Wuyi and Gutian starters concerns wines brewed with them. One paper also describes black-skin-red-koji use in cereal vinegar. Wine made experimentally with a particular starter is a study result and not a validated home recipe.

Food starter and supplement are different products

Red yeast rice sold as a dietary supplement is a separate product context. The US National Center for Complementary and Integrative Health covers that context, and its material should not be read as describing the starter used to brew wine.

History and what is not established

The papers call the practice old, and the review notes a statement that it goes back more than 1,000 years, but the earlier sources behind that statement were not inspected, so the age is attributed and not independently confirmed. The sources do not give a production season, a complete household method for making Wuyi hongqu, or a general storage period. Producer evidence from the region is needed to describe how far the name extends and how products differ.