The extraction of plant aromatic oil has been found in ancient times. Humans have discovered that plants or flowers with aromatic odors can refresh people's minds. After these plants are made into dry products, they can be used as medicines and spices. However, plant spices are volatile and not easy to store. The development of the spice trade in Europe in the Middle Ages led to the birth of plant aromatic oil extraction technology. In the 16th century, the technology for preparing plant aromatic oils was quite mature. In the 19th century, organic chemistry developed rapidly. People analyzed the chemical composition of plant aromatic oil to find the root of aroma, and then synthesized artificial fragrance. Today, plant aromatic oils are widely used in light industry, cosmetics, beverages and food manufacturing.
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