How is Yang's exclusive plaster made?

Henan Cultural Industry Network News: There is a 76-year-old man in the old city of Luoyang. Her name is Yang, and she is the eighth generation inheritor of Shayuan Plaster. She and her daughter Wu Jianli opened a small shop of more than ten square meters, specializing in plasters. According to her introduction, Chinese medicine has a long history. Plaster is one of the five dosage forms-pill, powder, ointment, Dan and soup, and its preparation method and curative effect are quite distinctive. Her family's plaster has now become the first batch of intangible cultural heritage protection projects in Luoyang. Yang said that Yang Rui, the founder of Shayuan Plaster in Shi Yang, Luoyang, lived in the early Qing Dynasty and his hometown is now Shayuan Village in Gezhai, Yichuan. He has studied medical books all over the world, and his medical skills are superb. 1947, Yang Baotian, the sixth generation descendant of Yangjia Shayuan Plaster, moved to Luoyang ancient city to practice medicine with his son Yang (the seventh generation descendant of Yang). Before liberation, Yang's method of cooking plaster was strictly confidential. After the founding of New China, Yang resolutely broke the family rules and family precepts of "passing on men but not women" and "passing on one's own surname and not passing on another's surname". 1956, Yang gave him the secret recipe from his ancestors, and he and his daughter Yang Yi went to work in Luobei District Public Treatment Center at that time and continued to boil plasters. Due to the shortage of plasters, in 197 1, Luoyang Luobei District Government and Luoyang Pharmaceutical Company took the lead in setting up Xiguan Plaster Factory, and Yang was transferred to the Plaster Factory to take charge of technical work. At the peak of the factory, there were more than 30 employees, and plasters were sold all over the country. In the 1980s, due to various reasons, the gypsum factory stopped production. 1986, in order not to lose the plaster technology, Yang began to boil plaster. Yang said that most plasters are based on vegetable oil and Zhangdan, and are made by decocting and mixing other herbs. The preparation method of plaster is divided into the following procedures: dispensing, decocting, applying, spreading and grinding. Among them, decocting is the most critical technology, and the temperature and method of decocting are very important, even the wooden sticks that stir the plaster are very particular; Boiled plaster should be removed from "fire poison" to ensure the safe use of plaster; In addition, before using the plaster, the ground powder should be sprinkled to ensure the curative effect.