The Spring Festival is approaching, and the beauty is always very hot, and everyone wants to have a "new year and new atmosphere". Among the various hairdressing items, hair coloring is favored by most people. But what is the matter with naturally occurring hair color in this "color changer", let's explore it together today.
Regarding the risks of hair dye and safe use, An An has also talked to you a lot, and friends who want to learn more can poke Which hair dye is safer? Can you dye your hair safely) (How to distinguish between permanent and semi-permanent hair dye?) ）Hair discoloration mainly depends on "it".
At present, most of the products on the market are permanent oxidative hair dye products, and the commonly used hair dyes for this kind of hair dye products are phenylenediamine, among which p-phenylenediamine is one of the important dyeing raw materials in oxidative hair dyes because of its firm dyeing and long-lasting coloring.
p-phenylenediamine, also known as Ursi D, is one of the simplest aromatic diamines due to the presence of amino groups and weak alkaline, and is also an intermediate with a wide range of applications.
Chromosome intermediates are reducible and easy to be oxidized by strong oxidants, and can change to different colors according to the type of oxidant and the oxidation process, such as purple-red, brown, black, etc. Taking p-phenylenediamine as an example, it can turn black when it meets hydrogen peroxide, and it can turn brown when it meets ferric chloride. P-phenylenediamine has a strong affinity for keratin in hair, and when the two are combined, the process of oxidation of p-phenylenediamine in hair is the hair dyeing process.
With the addition of p-phenylenediamine, the hair dye has been able to achieve a milestone success in terms of color durability. However, the presence of p-phenylenediamine also raises public health concerns, as it is classified as a Group III carcinogen. But in fact, the potential harm is not as serious as people think.
Our country has strict requirements for the dosage of p-phenylenediamine in hair dyes: the maximum allowable concentration shall not exceed 6%. Therefore, for qualified hair dyes produced by regular manufacturers, there is no need to worry too much about their carcinogenicity.
How to wash and care before dyeing your hair
A week before coloring your hair, it's a good idea to do a deep hair treatment to keep your hair moisturized. How well your hair is in condition will have a direct impact on the brightness of the color after coloring. At the same time, try to avoid washing your hair before dyeing your hair, which can improve the coloring effect of your hair color. In addition, the oil secreted by the scalp acts as a protective effect during the hair coloring process, preventing harmful substances from penetrating into the body.
You can apply some lotion to the periphery of your hair to increase the amount of oil to reduce the damage of hair dye to your body. If you wash your hair before dyeing your hair, it is best not to use conditioner, as conditioner will close the cuticle and affect the coloration. If your hair is very dry, you can start a week before dyeing your hair with conditioner for at least 5 minutes every night and stop the treatment the night before dyeing to avoid your hair becoming too dry after dyeing.
Care tips after dyeing your hair
1.Pick the right shampoo and hair care products. Friends with dry scalp and hair ends can choose a shampoo with mild ingredients, and at the same time use hair care products such as conditioner, hair mask, and hair oil; Friends with oily scalp and dry ends can choose a shampoo with an oil-controlling effect and a hair care product.
2.It is best to avoid bright sunlight for newly dyed hair, and remember to wear an umbrella and hat when traveling.
3.When washing your hair, the water temperature should not be too hot. When using hair dryers, straight clips, and electric curl rods, the temperature should not be too hot, and the hair dryer should not be too close to the scalp, otherwise it is easy to damage the hair and speed up the color loss.
It is best not to dye the hair of these people
People who are allergic to hair dye. Any one of the ingredients in hair dye can trigger allergies.
People with damaged scalp. For example, people with eczema, boils, ulcers and other damaged or diseased diseases, the toxic and harmful substances of hair dye are more easily absorbed into the body.
People who are old and frail, and have liver and kidney insufficiency. Such people have weak resistance, and the elderly have more gray hair, need a large area, or even the whole head is dyed black, and are more likely to have toxic reactions.
Pregnant and lactating women. During pregnancy, women have sensitive bodies, and hair dyeing is more prone to allergies.
People with a family history of cancer. It is more likely to develop tumors than the general population, so you should dye your hair as little as possible.
Conclusion
Although hair coloring satisfies the pursuit of beauty by beauty lovers, it is still recommended to reduce the frequency of hair coloring from a health perspective. In order to keep your hair shiny and smooth, you should take hair care before dyeing your hair and choose regular channels to buy hair dye products that meet national standards. After dyeing your hair, you should pay more attention to hair maintenance to have healthy and beautiful hair.
References:
1."Exploration of Hair Dyeing Mechanism - "Color-Changing Meter" of the Director of Phenylenediamine", China Medical News.
2.Are hair dyes carcinogenic? What is the difference between dozens and hundreds of pieces of hair dye? Popular Science China.