1. If the skin is not allergic to the essence, the mask used will not cause harm to the skin after safety monitoring. Essence is a common allergen, and some products suitable for sensitive muscles cannot be added with essence. Generally, the ingredients will be marked on the mask, and users can choose the products that suit them according to their own conditions.

2. The main function of essence in cosmetics is to cover up the smell of raw materials and give products a pleasant feeling in sensory aspects. Because many cosmetic raw materials have some unique smells, if they are not covered by essence, consumers will find it difficult to accept them. Besides, good essence can also give people more pleasant psychological enjoyment.

3. Essence is the raw material that endows cosmetics with certain fragrance, and it is one of the key raw materials in the manufacturing process. Proper choice of essence is not only loved by consumers, but also can cover up some bad smells in the product medium. Essence is a mixture of various spices, which has a certain type of aroma, that is, fragrance type.

4. Flavor blending is generally decided by perfumers according to consumers' preferences, and different spices are selected by experience. Spices generally include main fragrance, synthetic fragrance, modified fragrance and fixed fragrance, and can also be selected from the perspectives of head fragrance, body fragrance and base fragrance.