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Gu poison | From the blog of Nicholas C. Rossis, author of science fiction, the Pearseus epic fantasy series and children's books

Minority women in southern China were accused of poisoning northern men with a special poison made of venomous creatures. WELLCOME LIBRARY/CC BY 4.0 via Atlas Obscura

Fans of the film, Crouching Tiger, Hidden Dragon and the television show Sleepy Hollow may remember a powerful poison, used as a method to manipulate lovers and cause death. Atlas Obscura has the fascinating history of this legendary toxin — and I use the word “legendary” both figuratively and literally, as it is still unclear whether such a concoction was ever anything more than an ingenious way of marginalizing southern China minorities.

Dating as far back as 610 AD, travelers to southern China were warned of women who seduced travelers, feeding men meals laced with a powerful poison known as gu poison to keep their lovers from returning to their homes in the north. Gu poison, so the stories went, was collected by sealing venomous snakes, scorpions, and centipedes in a jar and forcing them to fight and devour each other. The surviving creature containing a concentrated toxin. Gu poison was considered a slow-acting poison. It was said to have no taste, allowing unsuspecting victims to go about their normal lives for as long as 10 days before they started feeling ill.

In the mountains, if a man was poisoned with gu and managed to return to his lover’s home within the time he had promised, his lover would treat him with an antidote. But if he did not, he would be consumed from the inside out, the gu poison causing his heart and abdomen to swell and ache because the poison gnaws him from within.

A Gu Recipe

Gu is also described as a form of black magic and witchcraft with the poison being a central part of the practice. Concocting a strong formula of gu poison required the “five poisonous creatures” in China: the viper, centipede, scorpion, toad, and spider. The poisonous insects, worms, and reptiles referred to as “chong,” were thought of as evil spirits or demons that possessed a vessel, or the human body. Gu poison has been associated with several regions and peoples in China throughout history but was most commonly linked to the Lingnan and Miao women, minorities of the south—creating stigmas based on northern prejudice.

There are several methods for formulating the perfect gu poison, according to Xu Chunfu, an official in the imperial medical bureau, who wrote about gu in 1556. The most well-known recipe is to gather different kinds of the “five poisonous creatures” and place them in a jar to fight. This was supposedly done on the day of the Dragon Boat Festival, which is the fifth day of the fifth lunar month. Some say that the jar is kept in darkness for up to the year. The body of the remaining venomous creature, which has eaten the others in the jar, will become the source of the lethal poison.

Xu also describes another recipe in which the gu sorcerer kills a poisonous snake, mixes it with an assortment of herbs, and sprinkles the body with water. The snake is left alone for a few days until its meat decays and begins to grow mold. The body is ground into a powder and slipped into wine.

Gu and Minorities

Gu poison | From the blog of Nicholas C. Rossis, author of science fiction, the Pearseus epic fantasy series and children's books

A representation of Miao women. Their public dancing and dresses were frowned upon by the Han Chinese. WELLCOME LIBRARY/CC BY 4.0 via Atlas Obscura

In medicine, gu poisoning became an indicator of sources of danger: sexual indulgence, sorcery, non-Han peoples, and native poisons. During the later periods, particularly during the Sui (581-617) and Tang dynasties (618-907), Chinese sources begin to associate gu poisoning with specific methods of magic attributed to minority cultures.

Gu poison connections with the Miao and Lingnan regions began popping up around the 17th century, with fears heightened in the mid-18th century. The timing was no coincidence. Descriptions of gu poisoned victims increased just after the Miao rebellion of 1735 and 1736. Northern Chinese disagreed with the Miao’s agriculture, social structure, culture, and particularly the independence of women. Miao women were thought of as “barbaric,” with their unbound feet, scanty dress, premarital sexual freedom, and ability to hunt and farm alongside men.

Unable to successfully instill northern Chinese influence in these regions, gu poison lore and gossip spread throughout the land to enforce ethnic boundaries out of fear of intermarriage with the Miao people. It is now the tribal women who are repeatedly cited as a source of danger, rather than armed men threatening the stability of Chinese rule over the area.

In 1556, Xu described the deep anxieties of gu poisoning. He explained that when the poison settles in the body it consumes the victim from the inside out with an internal burning. Symptoms are similar to heat exhaustion, the cursed lover experiencing prolonged fevers, loss of appetite and weight, and producing vomit like “soft (or rotten) cotton.”

By analogy, a woman who seduced a man though magical means came to be thought of as practicing gu poisoning. In most stories, victims of gu poisoning were men. Legend says that after several days of lovemaking, a woman may forbid her lover to return home and prepare a “fixed-time-of-year” gu poisoning, thereby killing the man if he does not return at the time he promises. However, there were some rumors that women, particularly the Miao women, captured children and fed them to their poisonous gu creatures. When the gu insects were fed young boys and girls, they defecated in shades of silver and gold.

A Gu Cure

Despite the lack of confirmed accounts, widespread fear of gu poisoning led to a boon of various methods to detect and cure it. Jiangnan physician Zhang Lu wrote in the 17th century of a method to detect gu poisoning in the Lingnan region: “If you eat in the homes [of people who live there] immediately take rhinoceros horn and stir [the food] with it. If [the food] develops a white foam, it is poisonous, if there is no foam, it is not.”

Gu poison’s make-believe tales were a product of prejudice against minority groups. Its association with the Miao and Lingnan women persisted well into the end of the 19th century, with some scholars even writing that the Miao were prohibited from attending markets in various places in China in the 1900s.

Even as late as 1942, Chen Guoqun advised travelers to carry silver-tipped chopsticks and dip them into food and drink offered in a Miao home. If the silver points change color, the food may be poisoned, he reasoned. Xu Chunfu wrote about 15 formulas that each treat a different kind of gu poisoning. These should be taken immediately after feeling any kind of discomfort in limbs after eating food.

Thankfully, the fear of gu and associated judgment of outsiders has since diminished and serves as a compass for historians trying to better understand differences between cultures in China. While the story of gu poison may be that of folklore, its impacts created real geographic and ethnic boundaries that lasted for centuries. But the idea of a sealed container of fighting deadly creatures is still sparking people’s imagination.