Cooling oil, also known as Wanjin oil, contains camphor, menthol oil, eucalyptus oil and cinnamon and other ingredients. The inventor was Hu Wenhu, a Fujianese. In the early years of the Qing dynasty, Hu Wenhu with his father in Myanmar opened a pharmacy in Rangoon, because Myanmar is located in Southeast Asia, belongs to the tropical monsoon climate, hot weather, abundant rainfall, mosquitoes, flies and insects, Hu Wenhu accordingly began to study herbal medicine, and absorbed folk herbal formulas of the South Seas and other countries, made the "Tiger Balm Oil". When people encounter mosquito bites, itchy skin or mild burns, take the oil coated with the affected area, that can activate blood swelling, analgesic itching; In addition, when the wind, headache, take the oil coated in the Hall of Indigo, temples, there will be a cool relief effect.　Marigold oil is the masterpiece of "aromatherapy", as the advertisement says, "a necessary medicine for home travel". At that time, people used to use Wanjin Oil (it was difficult to buy the authentic "Tiger Balm Wanjin Oil", and people called "Qingliang Oil" as "Wanjin Oil") as a universal medicine, which was used to treat the headache and treat the foot. The headache, foot foot, although "treating the symptoms but not the root cause", but also works. So the cool oil is better than the wind oil essence