Yunnan Baiyao Plaster is a topical preparation of the formula Yunnan Baiyao, known everywhere in China as the most effective of patent medicines. The story of Yunnan Baiyao and its inventor, Mr. Qu Huangzhang, is frequently told and even has been made into a film. In 1902 Mr. Qu Huanzhang, a practitioner of Chinese medicine who came from Yunnan Province and had set out to explore the entire region and taste its hundreds of herbs, formulated the seemingly magical medicine "Qu Huanzhang Panacea," which is now known as "Yunnan Baiyao (white medicine of Yunnan)".