How to test sunscreen, how to test sunscreen effect at home

Is it mainly moisturizing and non-greasy? What about SPF?

Test 1: Oil absorption test method: 8. Squeeze the sunscreen onto the oil blotting paper for 3 5 minutes, and observe the size of the oil ring on the face paper. The oil ring is not good.

Test 2: Impression of texture: When choosing a good sunscreen, the first thing you need to feel is the texture.

It determines the lightness and comfort of the sunscreen, such as whether it absorbs quickly, whether it sticks or not, whether it has a sense of mask, and whether it will rub mud? The first image of the texture is very important. Test Method:

Squeeze out the sunscreen and touch your nose with your hands to feel the texture of the skin.

Test 3: Will you get sunburned: Use sunscreen to prevent tanning, sunburn, and even getting old.

Then borrow oranges for a fun quiz. Not to mention, when they are applied with different sunscreens, they can really pull the gap when they are challenged by the sun at the same time. When purchasing, the right to be a ridiculous reference!

Test Method: Replace people with fresh oranges to feel UV rays, apply sunscreen to their bodies, and then expose them to the sun for 8 hours at the same time.

1) Mark the small oranges.

2) Put it in the sun and apply sunscreen to the small oranges.

3) Test results: The brighter and fuller the surface of the orange peel, the more it can withstand the test of sunlight.

Haha, I don't know if you're satisfied!

Here are a few things to consider when experimenting with sunscreens:

1.SPF test: This method is more commonly used and is a method to measure the UV protection of sunscreens.

This method uses a human** model, in which the experimenter first applies sunscreen and then uses a specific instrument to measure the rate of erythema formation under UV exposure** to calculate the SPF value.

2.Simulated ultraviolet exposure test: This method applies sunscreen to artificial**, and then uses an electronic ultraviolet radiometer to simulate the sun's ultraviolet radiation to detect changes in different times**, including**pigmentation, erythema, etc., to judge the sunscreen effect.

You can test accordingly depending on your needs. Please note that these tests are only intended to evaluate the sunscreen's sun protection effectiveness and do not constitute medical advice. If you have any questions or concerns about sunscreen, talk to a **doctor or a doctor at a specialized medical facility.

Put it in the sun and apply sunscreen to the small oranges.

Hello, kiss the hall chong, this is very simple, put a new version of RMB 100 yuan is 50 yuan under the transparent object of sunscreen, and use a purple light to shine on the transparent body with sunscreen to the trace of RMB. If the concealed part of the RMB is placed under a transparent object with sunscreen, and a fluorescent watermark of 100 or 50 can be seen under the purple light, it can basically be judged that the cream has no effect, and vice versa. That's fine, remember oh thank you, and have a great day.

Eat the whale [eat the whale].

1. When choosing, you must look at it, sunscreen, its packaging is marked and explained, that is, sunscreen generally does not contain oil, if it does, it is fake, and it is not recommended to buy.

2. The suspicion is still to get a little sunscreen, put it on the back of your hand, and then take a look to see if it was quickly stopped by the **slippery Hu absorber, if it is a good absorption, it is true, if the absorption is not good, it is false.

3. Of course, there is also that after applying, if there is no stickiness, if the ** feels breathable, it is true, if it is not breathable and has a sticky feeling, it is false.

4. General sunscreen, after its application, does not have a bright feeling, because it is sunscreen, not brightening. Therefore, if you become very white or shiny after applying, it is false.

5. Look at the moisture content of sunscreen again, in general, it is not a grade of sunscreen, the moisture contained in it is different, if you find that there is no grade on it, let alone water content, it is fake, it is not recommended to buy.

Look at the sun protection factor. SPF stands for sun protection time, and 1 order of magnitude is 15 minutes. For example, SPF30, the remorse interval is 30*15=450 minutes when sunscreen, and the plus sign after PA represents the strength of UVB protection.

In UVA and UVB, UVB's penetration ability and damage to ** are much higher than those of UVA, so the more + signs after PA, the better.

The higher the SPF, the greater the natural oiliness. If you choose an oil-free sunscreen, you can squeeze a little bit on the oil-blotting paper to see the effect.

Apply the sunscreen flat to the back of your hand and sprinkle a small amount of water, keeping an eye out for droplets

1. If it is in the shape of water droplets and can be rolled around on the back of your hand, then this is a waterproof sunscreen that needs to be removed;

2. If the water on your hands is flowing, this is not a waterproof sunscreen, and you don't need to remove makeup.

If it is an imported regular sunscreen, whether it has a waterproof function will be marked, especially for European and American brands, for sunscreen, a special-purpose cover loss cosmetics, package modification and labeling are strictly supervised, "waterresistant" is a waterproof description.

How to choose sunscreen? In summer, the sun is strong and UV damage is very serious, so it is especially important to choose a sunscreen that is suitable for you. So how do you choose a sunscreen? Let me introduce you to it.

Sunscreen can be chosen by following these steps:

1. Choose sunscreen according to your skin type.

In summer, the skin texture changes due to the difference in oil production. Therefore, one should do another accurate **test before purchasing. For oily skin, choose water-based sunscreens with strong penetration; For dry skin, choose a cream-like sunscreen; There are generally no strict rules for neutral**, and sunscreens in the form of lotions are suitable for all kinds of uses**.

2. Accurately calculate the SPF value.

All sunscreens are now specifically labelled and the following values indicate the sun protection factor of the product. Consumers can convert the SPF value of the sunscreen they need to buy by themselves. Generally speaking, the higher the SPF, the greater the protection.

In general, SPF 8 to 12 is advisable for ordinary type ** of personal sunscreen; **For fair-skinned people, use SPF30; For those who are allergic to light, it is advisable to choose an SPF value between 12 and 20. Office workers are only exposed to the sun on their way to and from work, so a SPF of less than 15 is sufficient.

For outdoor activities, it is recommended to use sunscreen with an SPF of 20 or so. When you are active in the scorching sun of the plateau or go swimming at the beach, it is advisable to use SPF 30 sunscreen. When swimming outdoors, it is advisable to choose waterproof sunscreen skin care products, but in addition to swimming, waterproof sunscreen skin care products should be used sparingly.

So how exactly should sunscreen be used? Here's what you know.

Use of sunscreen

1. Time of use.

Ideally, sunscreen should be used after cleansing and before applying makeup to ensure that it sticks to the cells that need to be protected. But in practice, after basically finishing your daily skincare routine, you can apply sunscreen and then apply your daily makeup. However, sunscreen, like general skin care products, takes a certain amount of time to be absorbed by the skin, so you should apply sunscreen 10 to 20 minutes before going out.

At the same time, it is important to note that the duration of the effect is determined according to the SPF or PA value of the product.

2. Apply the site.

Apply sunscreen to cover the neck, chest, arms, ears (areas that are particularly forgotten and sunburned), and any other exposed areas.

Precautions for using sunscreen

1. Apply the site.

When applying sunscreen, do not neglect areas such as the neck, chin, ears, etc., to avoid uneven skin tone.

2. Clean the product.

Always remove sunscreen thoroughly every night, so don't rest and sleep with sunscreen.

3. The amount of use should be sufficient.

Sunscreen is not effective when applied, but to reach a certain amount to exert an effect, usually sunscreen on the ** when the amount of 2 mg per square centimeter, in order to achieve the due positive sunscreen effect. It is important to note that SPF values cannot be accumulated, and applying two layers of SPF10 sunscreen will only have one layer of SPF10 protection.