Yingquan district tongchangxiang food additives operating department. Fuyang wholesale fried dough sticks additive was established in 20 13 of Tongchangxiang food additive business department in Yingquan District, located in Fuyang City, Anhui Province, and is an enterprise mainly engaged in wholesale industry. Alum is a kind of double salt of potassium sulfate and aluminum sulfate containing crystal water, which is mentioned in Materia Medica, Tang Materia Medica, Fang Chuanxin and other famous Chinese medicine books.