(1) According to the use of essence:
Essence can be divided into daily essence, edible essence and other essence according to their uses, as shown in Figur.
(2) According to the aroma or fragrance of essence:
Soap uses fragrances such as osmanthus, sandalwood, jasmine, rose, and grass.
Three flowers, bell flowers, osmanthus flowers, fruit aroma types, etc. are used for cream.
The aldehyde fragrance, flower fragrance, green fragrance, hundred flower fragrance, oriental fragrance, etc. used in perfume.
Edible oranges, sweet oranges, lemons, cream, vanilla, chocolate, almonds, cola type, etc.
Toothpaste uses mint, spearmint, fruit, holly, and other types.
Green plums, roses, osmanthus flowers, daqu, brandy, whiskey, etc. are used for alcohol.
Smoked tobacco, blended tobacco, etc.
(3) According to solubility, it can be divided into two categories: water-soluble (including alcohol soluble) and oil soluble.
(4) Classified by dosage form: divided into liquid (including slurry, emulsion), solid (including powder, block) and other types.
