The sisters spent a lot of money and effort on whitening and anti aging maintenance, but ignored the most basic and most important sunscreen maintenance. What should be paid attention to in order to effectively prevent sunscreen? If sunscreen is not done well, other maintenance is like work in vain, and even more serious problems such as sensitivity, sunburn and pigmentation will appear. Sunscreen is the most important is to defend against ultraviolet light damage, the following small series to give you universal sunscreen knowledge, strive to this spring and summer not to be tanned Oh!
The most important thing for sunscreen is to protect against ultraviolet light. There are mainly three kinds of light, UVA, UVB and UVC, which are separated by wavelength.
UVA: it can penetrate through the clouds and glass to enter the room and car. It will reach the ground and directly reach the dermis of the skin, causing fine lines, wrinkles, relaxation and other aging phenomena. It is also the main cause of forming spots and causing DNA damage of cells
UVB: part of it is absorbed by the ozone layer, part of it goes to the ground to produce melanin, which makes the skin black and red.
UVC: absorbed by the ozone layer, unable to reach the ground. At present, it has no direct effect on the skin.
Key points to choose high quality sunscreen:
1. Broad band sunscreen: defend UVA / UVB at the same time.
2. Refreshing, not greasy, good moisturizing power: only in this way can people be willing to use, and will not cause skin tightness and discomfort.
3. Add skin care ingredients: UV light can make skin black and old, and also make skin dry. Sunscreen products with moisturizing and soothing ingredients are better.
UV resistance algorithm
UV resistance algorithm: SPF coefficient - 1 & divide; SPF coefficient X 100% ex
SPF30: UV resistance is 30-1 & divide; 30 x 100% = 96.67%
Spf50: UV resistance is 50-1 & divide; 50 x 100% = 98%
In fact, the UV resistance of the two bottles is only 1.33% lower, but this is only a basic comparison. The PA factor and correct use mode should be considered for the perfect sun protection.
SPF 1 + 1 = 2? SPF30 + SPF25 = spf55. Wrong, the sunscreen barrier applied can only be based on the sunscreen power with the highest sunscreen factor.
Exfoliate after sun exposure?
Do not, although the sun will make the skin rough, but it is in a very fragile state, must not do exfoliation such as strong stimulation of maintenance, but should strengthen moisturizing and soothing.
You don't need sunscreen if you don't get sunlight?
Wrong, UVA is ubiquitous, but also through the glass sunburn skin, sunscreen is regardless of season and climate!
For general skin, it is recommended to use pore repair accessories after skin care and before sun protection.
When applying, first squeeze the size of mung bean on the finger pulp, and then tap on the part you want to cover, so that the product can enter into the pores to achieve the filling effect. As long as you do a good job in removing makeup and cleaning, you don't have to worry that the filling will cause pores to block again. But if you really want to tighten the pores, it will be better to cooperate with the maintenance methods mentioned above.