The "Siyanjing" vinegar produced by the old vinegar factory in Huairen Village, Zhangqing Township, Yuci is a traditional time-honored brand. The vinegar shop was founded in the middle and late Ming Dynasty. It was named "Yuquanqing" during the Daoguang period of the Qing Dynasty. It has been passed down from generation to generation and is now the Yuci Huairen Vinegar Factory. Because Huairen is located in Pingchuan, it is rich in high-quality sorghum. In addition, the local water quality is clear and pure, so the vinegar brewed is sour, soft, sweet and fragrant, and it has been prosperous for a long time. Huairen vinegar uses high-quality sorghum as the main ingredient, and the auxiliary materials are corn, bran, etc. The brewing process is divided into more than a dozen processes such as grain crushing, melting, steaming, alcohol fermentation, acetic acid fermentation, intoxication, vinegar pouring, vinegar drying, canning, etc. The average production cycle is about 20 days, and it must be sterilized twice during the period. The main production tools are vinegar vats, filter towers, smoked kangs, fermentation tanks, vinegar tanks, laboratory equipment, etc. The products are divided into seven major vinegar series such as "Siyanjing Brand", "Dengshanjing Brand" and "Longyanjing Brand". Huairen aged vinegar is dark brown in color, clear and bright in appearance, sour and sweet in taste, and neutral in nature. It enters the stomach and liver meridians, has the characteristics of long-lasting acidity, mellowness, no precipitation, no turbidity, and no white skin, and can be stored for a long time. This vinegar is not only a good seasoning, but also has the effects of nourishing and strengthening the body, aiding digestion, preventing colds and dysentery, etc.; when prepared with relevant medicines, it can reduce swelling, relieve pain, remove lumps, lower cholesterol, prevent vascular sclerosis, and treat hypertension, etc.; mixed with lime powder and applied to the affected area, it can remove solitary odor, help digestion and stimulate appetite, disperse blood stasis, stop bleeding, and detoxify, etc.