Different types of cosmetics have a different shelf life after opening. Specifically, mascara can be stored at room temperature and can be used for 3 to 6 months after opening. Cream eyeshadows are stored at room temperature and can be used for 1-2 months after opening; however, if the eyeshadow clumps or becomes darker during this time, you should stop using it. Eyeliners are stored at room temperature, liquid eyeliners can be used for 3 to 6 months after opening, and solid eyeliners can be stored for more than 10 years. The foundation is stored at room temperature or in the refrigerator, avoiding sunlight, and can be used for 1 to 2 years; but if it hardens, discolors, or produces a peculiar smell, it means that the oil components in it have deteriorated and should not be used again. The emulsion is stored at room temperature or in the refrigerator and can be used for 2 to 3 years. The odor indicates deterioration. Perfumes can be stored at room temperature for about 1 year. If the fragrance becomes weak and sour, it should not be used again. Lipsticks are best stored in the refrigerator, or away from sunlight and high temperatures, and can be used for several years; but if the seal is not good, the paste will absorb moisture from the air, so pay attention to mold prevention during storage.
Although the use period can reflect the safety of cosmetics to a certain extent, due to the complex packaging and use of cosmetics, and many factors affecting the quality of cosmetics, the quality of cosmetics cannot be judged only by the use period. Consumers should stop using cosmetics immediately if they notice a change in the color, texture, or smell of the product, even within the shelf life.
The sensory changes of different types of cosmetics after deterioration are also different. For example, the deterioration of cleansing products is mainly characterized by discoloration and odor, turbidity or precipitation, and a rough feeling when used; the deterioration of scrubs mainly includes discoloration, odor, and dry cracking; The most obvious feature is the separation of water and oil, which may also be accompanied by discoloration and odor, and a rough feeling when used; the main manifestations of toner deterioration are discoloration, odor, turbidity, and precipitation; mask deterioration will appear discoloration, odor, thinning, and change. dry phenomenon.