Tangtu Chemical Industry Record

In the seventeenth year of Zhenyuan, Shen Yanzhi, a modern chemical doctor, was transported to the Tang Dynasty due to an explosion in his laboratory and became a refugee in Yanhu, Longyou. With his knowledge of chemical industry, he broke through by improving the salt boiling process - using plant ash to extract alkali and remove impurities, and drying the brine to concentrate the brine. He revitalized the salt shop in Xishi, which was appreciated by officials of the Ministry of Industry. He then went deep into the salt ponds in Hedong and the farmland in Guanzhong, using organic fertilizers to increase grain production, coke ironmaking to improve armaments, and alcohol preparations to quell the plague, embedding the modern chemical system into the framework of the prosperous Tang Dynasty.