Teach you how to identify sunscreen digital hidden rules

What is the difference between SPF 15 and 30 sun protection strength? Data to speak!

UVB not only accelerates skin aging, but most skin diseases today are also incompatible with UVB. SPF means to resist the index of UVB in ultraviolet light. SPF is naturally important information that every Bottle of sunscreen must show.

Asian girls' skin will begin to show signs of sunburn in 15 minutes without any sunscreen. Then using SPF30 sunscreen, the sunburn time is roughly delayed to 30*15=450 minutes.

So is the higher the SPF value, the higher the intensity against UV rays, but it is not entirely true. Tell everyone about a formula. (SPF value -1) / (SPF value) * 100% more percentage is the strength of sunscreen products against UV rays. You will find that SPF15 and SPF30 are actually almost the same, just a matter of time.

2ml is the effective amount, less than it is really little.

The effect of sunscreen depends not only on the SPF and PA index, but also on the correct technique and dosage of the application. When applied too little, it has little natural effect. Use the size of a dollar coin and 2ml each time to achieve the desired amount.

However, many girls will feel that using a large dose of sunscreen will have a sticky feeling, or worry about getting rid of acne and acne.

If you have this kind of trouble, tell everyone a good way, after a thin layer of sunscreen on the whole face, focus on the cheekbones, bridge of the nose and chin repeatedly to ensure that these parts can achieve the desired sunscreen strength. Have you noticed that the general small spots are sprouting from the tibia and the bridge of the nose, so it is absolutely correct to focus on these places.

Give the skin 20 minutes to digest the sunscreen effect before going out.

Sunscreens, like general skin care products, take time to be absorbed and function. So be sure to apply it 20 minutes before going out, let the sunscreen penetrate into the horny surface, so that it can really block the UV effect.

And apply sunscreen must be placed in the final step of the skin care program, any skin care products, even simple water quality products will dilute or dissolve sunscreen ingredients, destroying the sunscreen effect.

All say 1+1=2, but this theorem in the world of sun protection can not count.

It is said that 1+1=2, but it is not recommended for girls to superimpose sunscreen products, let alone whether the sunscreen effect can really overlap. The chemical composition of each brand's sunscreen products is inconsistent. If used in combination, overlapping on the skin will increase the burden on the skin, which can easily lead to sensitive conditions. Moreover, different sunscreen ingredients interfere with each other and can also destroy the original sunscreen strength.

And the SPF value can not be added, even if the two layers of SPF10 sunscreen, only one layer of SPF10 protection.

Tell you the reason for 360° zero dead angle sunscreen for 365 days.

The form of ultraviolet light is not only light that reaches the ground directly, but also includes various emitted and scattered light. Therefore, even in the dark, do not take lightly on the ultraviolet light, their strength is absolutely not trivial.

Look at the UV reflectivity of these everyday ground conditions: 80% in snow; 10~25% in beach; 10~20% in water; the asphalt road at the foot also has a 10% reflectivity, amazing!

And as the altitude and moderation increase, the intensity of ultraviolet light will gradually increase. Is the reason for 360° zero-dead sun protection for 365 days a year not enough?

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