According to legend, a man named Dukang this region of Yuncheng in Shanxi Province who invented wine. Dark Tower of his son, also with Dukang learned winemaking techniques. Later, the family moved to the black tower rate where is Zhenjiang, Jiangsu Province. There, they throw away wine lees, I felt pity to store up and soak in the tank. To the 21st of shi, a tank opened, never heard of an aroma from the aroma. Lured by the rich aroma, taste a mouthful of black tower, both sweet and sour taste is very beautiful, as they store the "seasoning paste." What is the name that seasoning paste it? Add to the 21st Dark Tower "unitary" character to name this acidic water is called "vinegar." It is said that, until today, the town of Jiang Hengshun Cuchang brewed batch of vinegar sauce, or twenty-one days duration.