Baking soda to blackhead skin will be damaged, the blackhead removal method should be used right! Online baking soda can be used to remove blackheads, which is economical and convenient. But if you really follow this rumor, the blackhead will not become less and the skin will be damaged. Break the rumor now!
Rumor: '5 cents + 10 minutes = blackhead clean! No damage to the dermis, no damage to pores, no expansion of pores! Both men and women. " What is so exciting is not advertising words, but the widely circulated way to remove blackheads with baking soda on the Internet. According to the rumor, only a small amount of baking soda powder needs to be dissolved in water in the ratio of about 1:10, wet it on the nose with a cotton pad or cotton ball, and the blackheads will float out in 10 minutes. A bag of 500 grams of baking soda costs only 4 yuan. It can be used at least 100 times, and the cost is only 4 cents each time. It is more economical than all kinds of nose paste derived liquid god horse.
Truth: everyone hates blackheads. What is blackhead?
In fact, blackhead is an open acne, because the sebaceous glands secrete too much sebum, which accumulates in the duct, blocks and hardens, and then oxidizes and blackens in the air. If you are a person with oily skin and hair, you may feel that sebum is very annoying, but in fact, it can moisturize the skin and prevent the evaporation of skin moisture; Sebum is weakly acidic and can also inhibit and kill bacteria on the skin surface, so it is really indispensable.
[the left side of the figure above is the normal pore structure, and the middle is the blackhead structure. There is no need to explain what is on the right side]
Baking soda is composed of sodium bicarbonate (NaHCO3), which is often used as the bulking agent of food. The aqueous solution is weakly alkaline. After it is dissolved in water, it will react with the weak acid in the bulking agent to produce carbon dioxide. Our steamed bread, biscuits, cakes and other foods are full of small bubbles and become crisp or soft, which has its credit. Why is it related to blackheads?
Baking soda can't get rid of blackheads
Among the online explanations for removing blackheads with baking soda, one is' blackheads themselves are acidic. Baking soda is alkaline. After neutralizing the acid and alkali, the blackhead dissolves, so it comes out as soon as you rub it, and it has no bad effect on the skin. "
Acid base neutralization seems reasonable, but let's think about it carefully. As a blackhead of oil, can it be easily dissolved by the aqueous solution of baking soda? There must be a certain attraction between acid and base before neutralization reaction can occur. Oil and water are incompatible. This force is very small and the reaction speed is very slow. The contact between blackhead and baking soda solution may take several days to dissolve - the skin was burned before the blackhead was removed.
There is another explanation on the Internet, which seems more professional: 'baking soda is weakly alkaline after dissolving in water. Under alkaline conditions, the oil will undergo saponification reaction to produce glycerol and fatty acid salt. The water solubility of glycerol and fatty acid salt is better. The main component of blackhead should be the oil secreted by the body. If you apply baking soda solution to the nose for more than ten minutes, the above reaction will occur. The substances produced are dissolved in water, so you can achieve the effect of removing blackhead. " Under the catalysis of alkali, oil will indeed hydrolyze to produce glycerol and fatty acid salts. This process is a step in the production of soap, so it is called saponification reaction. However, we should note that the saponification reaction is relatively slow, and its speed is closely related to the alkaline strength and reaction temperature. We usually use strong conditions, such as strong alkali such as sodium hydroxide, to heat and boil for about 3.5 hours before the reaction can be complete. If it is room temperature, under weak alkaline conditions such as baking soda, even if it is not completely unable to react, wait until the reaction is completed. When your nose is not likely to be still there, it will not happen for more than ten minutes.
In addition, 'alkali can decontaminate' is also a common sense of life we often hear. In practice, sometimes it is used to wash oil in alkaline solution to avoid froth. This is a combination of saponification, wetting, emulsification, dispersing and so on. The lye is a mixture of 40%-80% sodium hydroxide and a certain amount of sodium carbonate and sodium phosphate. It has strong alkalinity and generally needs to be pressurized and sprayed at more than 70 degrees. The alkaline surface (also known as soda, edible soda and soda) that can be used for decontamination in the family is composed of sodium carbonate (Na2CO3), which is more alkaline than baking soda, and the pH value of the aqueous solution can reach more than 11. Even so, the decontamination ability of soda ash is still difficult to compare with common detergents. You will know if you have washed greasy bowls with it. In short, in order to have a good decontamination (i.e. dissolving grease) effect, it is necessary to use a strong alkali to perform a relatively violent mechanical action (friction or flushing) at a relatively high temperature. It doesn't sound very reliable to put these means on the face, does it?
Baking soda is easy to hurt the skin
As for whether applying baking soda solution to the nose has no side effects as said on the Internet, let's see what happens when it dissolves in water. First, the solubility of baking soda or sodium bicarbonate at room temperature (25 & deg; c) is 96g / L. In water, NaHCO3 will undergo the following two equilibrium reactions:
Reaction 1 is dominant, the solution will be slightly alkaline, and the pH of saturated sodium bicarbonate is 8.31 (pH 0 to 7 is acidic and 7 to 14 is alkaline). Our skin is slightly acidic, because the slightly acidic environment formed by skin secretions is not conducive to bacterial survival and has a protective effect on human body. The pH value of healthy skin is about 5.0 to 5.6. Remember that many cleansing products are trying to publicize their 'weak acidity, mild and no harm to the skin'. Applying alkaline solution on the skin destroys the natural barrier of the skin, makes the skin more prone to dehydration and dryness, and some skin are sensitive and easy to tingle, redness and swelling. In the past, when washing your face with soap, your skin was easy to be rough and dry for a long time, because the soap was alkaline. If you apply baking soda to your nose once or twice a week, it is unlikely that there will be less and less blackheads, but it is likely that the skin will become more and more rough and sensitive.
Blackhead: it's not easy to say goodbye
Sebaceous glands open in pores. If the secreted sebum can be discharged smoothly, blackheads will not be produced. Therefore, instead of painstakingly removing blackheads, it is better to strengthen cleaning, exfoliate, prevent pore blockage and avoid blackheads.
Therefore, some ingredients that can effectively soften cutin and promote cutin peeling, such as salicylic acid (also known as BHA) will have a better blackhead removal effect. In addition, commonly used exfoliating ingredients include fruit acid (also known as aha, & alpha; - hydroxy acid) and salicylic acid. They all act on the skin surface to help exfoliate cutin and dead skin. Theoretically, they will not harm healthy skin cells when used at a reasonable concentration, and they need continuous use to maintain the effect. The difference is that fruit acid is water-soluble and salicylic acid is oil-soluble. Therefore, salicylic acid can help dredge the blockage in pores, and fruit acid is more suitable for removing dead skin accumulated on the surface due to sun exposure and drying. However, it should be noted that the pH value of salicylic acid is between 3 and 4, which is acidic. Some people with sensitive skin may not be suitable for use.
If there are stubborn blackheads that are difficult to dissolve and must be picked out, first open the pores as much as possible through hot compress or fumigation. Articles such as acne needles should be disinfected and wiped with alcohol. After picking out blackheads, you can use some anti-inflammatory and calming means (such as ice compress) to help shrink the pores, and then it's time for the skin to have a good rest.
Conclusion: rumor cracking. As a weak alkaline solution, baking soda solution can not dissolve blackhead through acid-base neutralization or saponification reaction, and its alkalinity can stimulate the skin. If you really rub things down in the experiment, it is mostly the dead skin cells and stratum corneum that fall off due to rubbing. To remove blackheads, some products containing salicylic acid are more effective, or blackheads can be picked out under the condition of paying attention to hygiene, but it should be noted that these will stimulate the skin to a certain extent. The usual work and rest rules and maintaining appropriate temperature and humidity are helpful to adjust the secretion of sebaceous glands. It can be regarded as a means of 'prevention is better than treatment' for blackheads.
After knowing the truth, are you still going to listen to rumors and use baking soda to blackhead? Don't stop hurting your skin!