In the 20th year of Jiaqing in the Qing Dynasty (1816), Dongjiahu farmers Dong Sanfang, Cai Lang and more than ten other farmers adopted the principle of "one thing subdues another, gypsum subdues tofu", used boiling water to thicken starch, punched a few holes in a gourd ladle, and drained it into vermicelli. Donghu farmers in Liuji Town, Guzhen County have been using locally grown sweet potatoes to process vermicelli for more than 190 years. At that time, every household would use traditional process flow to process vermicelli. Additive-free vermicelli is a traditional Chinese material cultural heritage. It has high labor intensity, low output, and basically no inheritors. Traditional vermicelli is now replaced by machine vermicelli. Machine vermicelli is all added with a variety of chemical ingredients such as amylase, pigment, glue, sulfur, and gluten enhancer. Vermicelli produced by traditional technology is a natural green food, purely handmade, smooth and delicate, and chewy. It is a good raw material for hot soup and seasonal snacks. It is deeply loved by urban and rural residents and has a large market demand. On December 26, 2007, six farmers including Donghu farmers Cai Daoxian, Dong Zehan and Cai Cha registered with the Guzhen County Industrial and Commercial Bureau and established the "Guzhen County Jinxiangsi Vermicelli Professional Cooperative". In 2008, 128 farmers were developed, and in 2009, the number increased to 238, with a yam planting area of more than 2,000 acres. Subsequently, it was registered as the "Jinxiangsi" brand trademark with the State Trademark Office, and five specifications of barcodes were applied for at the Anhui Provincial Standardization Institute. Vermicelli uses local fresh yams, and the technology of the paste method is adopted: the paste is poured on the ladle and the powder is frozen and packaged, with five traditional process flows, without adding any chemical agents, and 100% of the detoxified yam starch is used as the raw material to maintain the original yam aroma, which is an original ecological green food. (No pictures yet, welcome to provide.) (No pictures yet, welcome to provide.)