Triol, called glycerol according to the national standard, is colorless, tasteless, sweet, clear and sticky in appearance, and is an organic matter. Commonly known as glycerol.

Glycerol can absorb moisture in the air, as well as hydrogen sulfide, hydrogen cyanide and sulfur dioxide. Insoluble in benzene, chloroform, carbon tetrachloride, carbon disulfide, petroleum ether and oil. Glycerol is the skeleton component of triglyceride molecules. The relative density is 1.26362. The melting point is 65438 07.8℃. The boiling point is 290.0℃ (decomposition). The refractive index is 1.4746. Flash point (open cup) 176℃.

Essential oil is a volatile aromatic substance extracted from flowers, leaves, stems, roots or fruits of plants by steam distillation, extrusion, cold soaking or solvent extraction. Essential oils are divided into diluted (compound essential oils) and undiluted (unilateral essential oils) such as cactus seed oil. Essential oils are highly volatile and will evaporate quickly when exposed to air, so they must be kept in a dark bottle that can be sealed.

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The history of plant essential oils can be traced back to ancient China, Egypt, Arabia and Greece. During the period of "Three Emperors and Five Emperors", it was said that Shennong tasted all kinds of herbs, which was also the earliest historical data of using plants in the medical field. Hua tuo, a famous doctor in the Three Kingdoms period, used Jiang capsule and benzoin to prevent and treat diseases such as corpse transmission, lung flaccidity and seasonal qi.

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