Summer is coming, do MMs buy good sunscreens ? If you haven't bought it yet, Xiaobian reminds everyone to look at the product evaluation and buy the best sunscreen. The following is the explanation for the use of sunscreen.
The necessity of applying sunscreen: The ultraviolet spectrum in sunlight is in the wavelength range of 100 to 400 nm, which can be divided into three bands, namely, short-wave ultraviolet (UVC) having a wavelength of 100 to 290 nm, and ultraviolet (UVB) having a wavelength of 290 to 320 nm. And long-wave ultraviolet (UVA) having a wavelength of 320 to 400 nm. Ultraviolet rays of different wavelengths have different depths of penetration through the skin. UVC is the stratum corneum reflection and absorption, only a small part penetrates into the superficial epidermis. However, since UVC passes through the atmosphere, it is mostly absorbed by the ozone layer and cannot reach the surface of the earth, so it does not pose a hazard to human skin. UVB is also mostly absorbed by the epidermis, and a small part reaches the superficial layer of the dermis, which is the main band of skin damage. It is carcinogenic but can be blocked by thick clouds, clothing and glass. A small part of UVA is absorbed by the epidermis, and most of it can penetrate into the dermis and reach the middle of the dermis. UVA reaches the surface of the earth at noon in summer, which is 100 times more than UVB. It can penetrate the epidermis to the dermis and cause dermal damage, so it is the main ultraviolet pathogenic spectrum.
Sunscreen is effective in preventing the production of melanin. It is not black or sunburned, and it can keep youthful and moisturized at all times. The principle of sunscreen is to separate the skin from the UV rays.
Sunlight is the main cause of skin aging and skin surface spots. Even in spring, if you let the sun shine for ten minutes, the skin will prematurely decay for ten days. I talk about sun protection every year, but do people really know all about sun protection? Undoubtedly, the concept of sun protection has been recognized by more and more Chinese women. Vichy has conducted a survey of Shanghai women in 2003. Up to 69% of women use sunscreen products in the summer and use it 6 times a week. This year, major brands have launched new products with high sun protection value. Even if they only increase the sun protection value of the original products, they can see the importance attached to the sunscreen market.
The correct use of sunscreen:
After cleaning your face, first apply a layer of toner or lotion, then go out half an hour before you go (must remember) apply the sunscreen product of your choice. (Recommended to use sunscreen lotion in summer, it is refreshing, winter Use sunscreen,)
If you use it, you should look at your skin type. If you use oil, don't use too much. If you go out, you may feel more oily on your face. If you are neutral or dry, you can use it according to the general dosage. I am neutral. Just like applying cream in peacetime, it is enough to squeeze out the index finger cover. This is the amount of use. In fact, the sunscreen index of your sunscreen product is more important.
For the yellow race, it is calculated as follows: Generally, the average yellow person's skin can withstand sunlight for 15 minutes without being burned, so using SPF15's UV protection products will have about 225 minutes of sun protection time. Objectively speaking, the level of the sun protection index reflects the UV protection ability of sunscreen products. The higher the SPF index, the greater the protection given, but the increase in SPF value is not directly proportional to the ability of the screen to block UV light.
If it is normal, generally SPF6~10 will be fine. If the sun is very strong, you need to use 15~30. In summer, I will use SPF30.
In addition, how long it takes to rub the sunscreen is to see how many times it is. If it is 15 times 3-4 hours, then rub 25 times 5-6 hours and then rub 30 times 7-8 hours and then rub the general office workers to rub 15 times. Just fine.
In fact, the light sunscreen does not necessarily resist all the ultraviolet rays. If it is particularly strong in the summer, it is recommended to put on a parasol or a sun hat. It should be noted that the eye area is very easy to sunburn. Wearing a pair of sunglasses before going out is a good choice.
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