Now people have more and more demand for hair coloring, young people pursue fashionable hair colors, what cherry blossom powder, denim blue, Polaris green. Older people also yearn for a younger appearance, dyeing black and white hair, and the years are not terrible.
(Source: soogif)
Due to the popularity of self-service hair dyes, more and more people are beginning to dye their hair at home, and with the ease of use, the frequency of hair coloring is also getting higher and higher. So how much do you know about the physical impact of hair coloring on your hair coloring?
In the cognition of many elders, there are a large number of heavy metals in hair coloring products. In fact, hair dyes made of heavy metals have basically withdrawn from the stage of history because they accumulate toxins in the human body.
At present, most of the hair dyeing products on the market are oxidized hair dyeing products, and the commonly used hair dyeing agent of this hair dyeing product is phenylenediamine, of which p-phenylenediamine is one of the important dyeing raw materials in the oxidative hair dye because of its firm dyeing and long-lasting coloring.
However, p-phenylenediamine is considered to be a three-class carcinogen, that is, a substance with "insufficient evidence of carcinogenicity", and tea and coffee also belong to the three types of carcinogens.
It is worth noting that although the evidence of carcinogenicity of p-phenylenediamine is insufficient, it is easy to be sensitized. There are also studies that show that due to the professional nature of hairdressers, long-term exposure to phenylenediamine-based oxidized hair dyes can lead to an increased risk of cancer.
What is said here is "occupational exposure", that is, due to occupational factors, most people are exposed to hair dye products every day, and most people dye their hair two or three times a year, and the risk of cancer is far from meeting the requirements of "occupational exposure" [1].
Although hair dyes are safe for most ordinary people, the country still has strict regulations on this, in the 75 kinds of hair dyes that are allowed to be used, the maximum allowable concentration is in the range of 0.05% to 4%, it can be said that as long as it is a qualified product, daily use is no problem [2].
In addition to hair dyes, "color developers" are also important in hair coloring products, which usually include strong oxidants such as hydrogen peroxide and sodium perborate. These ingredients can not only oxidize the melanin in the hair into colorless, but also cause strong irritation to the skin, so many people will feel that the scalp is "prickly" when dyeing their hair.
Now many people like to buy hair coloring products from shopping websites, which has a problem, the products bought are not necessarily formal, so it is recommended to buy from the brand's official online store, or you can buy products with anti-counterfeiting codes.
In addition, if you buy foreign-produced products, then some of the ingredient standards are likely to differ from national standards, but as long as they are formal, there will generally be no problem. So be sure to choose a reliable purchase channel!
(Source: Network)
1. Does hair coloring cause cancer?
To be sure, occasional hair coloring does not cause cancer.
However, it is not ruled out that frequent hair coloring may increase the risk of cancer, so it is recommended to dye hair up to 2 to 3 times a year [1].
2. Is the lighter the color of the hair color cream the greater the damage to the body?
Theoretically, hair dyes of all colors have similar effects on the human body. The key is to dye light-colored hair, in order to better color, you must first "bleach" the melanin in your hair. So the lighter the color of the dyed hair, the longer it takes to bleach the hair.
The longer the scalp and hair are exposed to the environment of strong oxidants, the more irritation and damage they naturally suffer, and the risk of allergies increases [3].
3. About the barbershop hair dye pit
Tony, a teacher at the barbershop, always recommends a treatment before hair coloring, or recommends a more expensive pure plant hair dye.
So is this an IQ tax?
In fact, there is a certain basis for scalp care before hair coloring, as mentioned earlier, the color developer in hair dyeing products will have a strong irritation to the scalp, if you apply the right product on the scalp in advance, it can play a certain role in isolation.
In the hair ring, there is also a legend that it is best not to wash your hair before dyeing your hair, which also makes sense, and the oil secreted on the scalp and the metabolic keratin can play a certain protective role [4].
Pure plant hair dyes are better than ordinary hair dyes, which are not convincing, and the active ingredients in all hair dyes are similar to the chemicals mentioned above, and if additional plant extract ingredients with unknown contents are added, the risk of allergies may be increased [3].
4. Which is more appropriate, home hair coloring or hair coloring at barbershops?
From an economic point of view, it is certainly more appropriate to dye hair at home, the disadvantage is time-consuming and laborious, especially the novice operation is not standardized, unskilled, not only the effect of hair dyeing may be greatly reduced, and the hair dye is easy to stain the scalp, which may cause physical harm.
The advantages of choosing a barbershop are also obvious, professional hairdressers can better control the hair color, decolorization time, uniformity of hair dye application, etc., you just have to sit there and wait for the beauty to become beautiful, the disadvantage is that it spends a lot of money and is not very friendly to social phobia patients...
1. Do not dye your hair if there is inflammation or damage to the scalp.
2. Do not wash your hair two days before dyeing your hair.
3. Do a good job of protective measures before dyeing, apply creams such as petroleum jelly in advance in the ears, neck, hairline, etc., and do a good job of isolation.
4. 48 hours before hair coloring first test sensitivity, take a little hair dye, apply to the ear and other inconspicuous places, observe for a few minutes, see if there are allergic symptoms, if there is tingling, redness, peeling, please stop using.
5. Wash the hair several times after dyeing and wash the residual chemical components.
If you're dyeing your hair at home, take extra note:
1. It is best not to mix different brands and models of hair dyes.
2. Confirm whether the amount of hair coloring product is enough to avoid the embarrassment of half of the hair dye cream.
3. Pay attention to timing, play mobile phone forget the time after applying hair dye!
If you're dyeing your hair at a barbershop, take extra note:
1. Ask the brand of the hair coloring product before coloring and confirm that it is a regular product.
2. Communicate with the hairdresser clearly in advance of the color of the hair color to avoid disagreements later.
3. Choose hair coloring products that suit your economic ability and consume rationally.
Well, today's article is here, I hope to help you who love beauty.
Review expert: Shi Shuxian | Associate Professor, Laboratory of Bioenvironmental Materials, Beijing University of Chemical Technology
bibliography
He Congfen,Wei Shiyu. "Color change meter" directed by p-phenylenediamine[N]. China Medical News, 2019-12-18(003).
[2] Cosmetic Safety Technical Specification (2015 edition), CFDA Announcement [2015] No. 268. http://www.sda.gov.cn/WS01/CL0087/140161.html . 2015.
Chu Hong. Those things about hair coloring[J].Jiangsu Health Care, 2020(09):44-45.
[4] It is best not to wash your hair before dyeing your hair[J].Invention and Innovation (Big Technology), 2019(01):46.
*The content of this article is a popularization of health knowledge and cannot be used as a specific diagnosis and treatment recommendation, nor is it a substitute for face-to-face consultation by a practicing physician, for reference only.
*The copyright of this article belongs to Tencent Medical Code, unauthorized media reprinting is prohibited, and illegal reprinting will be investigated for legal responsibility according to law. Individuals are welcome to forward to the circle of friends.
* Welcome to WeChat search and pay attention to the public account "Tencent Medical Code" to get more health science knowledge.