The earliest historical applications of fragrances began with natural flavors. By natural flavors, we mean substances that are isolated by purely physical means from natural aromatic plants or animal raw materials. They are usually considered safe. This includes essential oils, tinctures, extracts, purified oils, spices, oleoresins, etc.
Natural fragrances are an important part of the fragrance industry. At present, more than 3,000 kinds of aromatic plants have been found in the world, but only 200 kinds have been industrialized. Among them, the use of natural essential oils as semi-synthetic raw materials, such as citronella oil, cypress oil, mountain cedar seed oil, lemongrass oil, lemon eucalyptus leaf oil and safrole oil. A large number of other citrus essential oils are used, such as sweet orange oil, lemon oil, white lemon oil, aromatic lemon oil, red orange oil, round grapefruit oil, peppermint essential oil, and spearmint oil.