Do you know lipstick
Lipstick is a type of cosmetic cosmetic for lips. Lipsticks include lipsticks, lip sticks, lip glosses, lip glazes, etc., which can make lips rosy and shiny, moisturizing and protecting lips; lipsticks can increase facial beauty and correct lip contours, making lips more lively and vibrant.
The shelf life of lipstick is generally about three years, but it will vary according to different brands.
After the lipstick is opened, the shelf life will be shortened in contact with oxygen and the environment. Generally speaking, unopened lipsticks are good for three years, while after opening it may be shortened to two years. Although some lipsticks look fine on the outside, the "inside" has deteriorated, so don't use them anymore.
The performance of lipstick deterioration:
1. The lipstick has spillage. Some people also refer to this phenomenon as "sweating". When the lipstick is not stored properly, and the storage place is high temperature and humid, the quality of the lipstick will deteriorate, and then there will be spillage.
2. The lipstick has an oily smell. This phenomenon is more common in high-end lipsticks, and the reason is caused by rancidity and oxidation. Generally speaking, some advanced lipsticks will add natural ingredients such as advanced grapeseed oil and jojoba oil, which are prone to produce a large amount of unsaturated fatty acids. When the phenomenon of rancidity and oxidation occurs, the smell of oil appears.
3, beyond the shelf life of the product. Generally speaking, the shelf life of unopened lipsticks is three years, while the shelf life of unopened lipsticks is less than two years.