How long can the primer be used after opening? How to check if the primer is expired?

If the isolation cream is used correctly, it will not harm the skin. However, after using the isolation cream, you must remove the makeup, otherwise it will cause great harm to the skin. So how long can the isolation cream be used after opening? How to check whether the isolation cream is expired?

It can be used for six months to one year. Generally, the shelf life of an unopened primer is two to three years. Primer can isolate dust and impurities in the air, adjust skin color, and some primers also have sun protection functions. It is a very common cosmetic. Once the primer is opened, due to long-term exposure to the air, the active ingredients and nutritional value inside will gradually decrease with the frequency of use, and even some chemical changes will occur, resulting in some by-products that are not good for the skin. Therefore, the shelf life of the primer will be shortened a lot after it is opened.

1. Check the date: Currently, almost all daily necessities have a shelf life. To determine whether an item is expired, the first thing to look at is the production date and shelf life on the packaging. The second thing to pay attention to is the date after opening. These dates are all important.

2. Look at the texture: Under normal circumstances, the texture of the isolation cream is relatively refreshing and non-sticky. If you feel the texture is sticky after applying it on your face, it is not applied evenly, and the effect is not as good as before, then such isolation cream is likely to be an expired product and should be used with caution.

3. Smell: Various cosmetics have special scents. If the scent of the primer has changed when you use it again after opening, do not use it again. This may be a phenomenon that the internal ingredients of the primer have changed, which is also a sign of expiration.

1. Apply sunscreen on your feet: Although the isolation cream that has just expired cannot be applied on the face, it can be applied to the feet and can also provide a certain sun protection effect.

2. Wipe leather shoes: Apply a little expired isolation cream on leather shoes or leather products to form a protective layer to isolate the leather from oxidation and damage caused by ultraviolet rays, dirty air, etc., thereby extending the service life of leather products.

3. Apply to the suction cup: The isolation cream contains some moisturizing molecules. Applying it on the suction cup can increase the pressure of the suction cup and make the suction cup stick to the wall more firmly. This will be very convenient for hanging clothes and other things.

1. The sunscreen is too thick: If the sunscreen looks like mud after being applied on the face, it may be because the texture of the sunscreen is too thick and not suitable for your skin type.

2. Wrong way of applying makeup: If you apply makeup directly with your hands when applying primer, it will easily cause the primer to rub into mud, because this will increase the friction between your hands and the skin of your face, which will easily cause the primer to rub into mud.

3. The stratum corneum is too thick: The stratum corneum is the outermost layer of the skin. With the metabolism of the skin, the stratum corneum will gradually become thicker. At this time, the foundation cannot fit the skin well, and it will easily rub off.