Supplement:

Perfume is a mixture of essential oil, fixative, alcohol and ethyl acetate, which is used to make objects (usually human parts) have a lasting and pleasant smell. Essential oil is extracted from flowers and plants by distillation or liposuction, and fragrant organic matter can also be used. The fixative is used to mix various spices, including balsam, Long Xianxiang, air gland secretions of civet cats and deer. The concentration of alcohol or ethyl acetate depends on whether it is perfume, eau de toilette or cologne. The shelf life of perfume depends on the preservation environment. It can be preserved for a long time, decades or even hundreds of years in a shady place.