Perfume has a shelf life. In general, the shelf life of perfume is one year. If the smell of perfume becomes weak or sour, it proves that the interior of perfume has deteriorated and needs to be discarded immediately. When storing perfume, it should be kept in a cool and ventilated place, avoiding high temperature. If it is placed in a high temperature place, the taste of perfume will change to a certain extent. After using the perfume, be sure to tighten the bottle cap of the perfume to prevent the perfume from volatilizing when it comes into contact with the air. Simply put, perfume, essence and spice are all volatile substances; They have a certain aroma and fragrance, which can be perceived by human sense of smell or taste; It is required to achieve the purpose of pleasing people, being cheerful, enriching and beautifying people's material and cultural life. Perfume is a product in which perfume is dissolved in ethanol. Sometimes a small amount of additives, such as pigments, antioxidants, fungicides, glycerol, surfactants, etc., can be added as needed. Different types of perfume are prepared by blending (that is, the technology and art of blending essence). What are the wonderful uses of expired perfume: 1. As an expired perfume, it also has fragrance. If you drop it on the incense lamp, the whole room will give off fragrance. 2. Spray on dried flowers Spray expired perfume on dried flowers and put it in a pillow or quilt to help you sleep. 3. Used for laundry. Soak the washed clothes in a basin sprayed with expired perfume. When clothes are dry, they will give off fragrance. 4, used to mop the floor, the last time you mop the floor, add some expired perfume, which will make the floor emit a faint fragrance. 5. Spray expired perfume on cotton as fragrance. Put it in a perforated glass bottle, which can not only be put in the closet or toilet, but also play the role of fragrance.