What Does a Hair Color Expert Do?

A hair dye is a cosmetic product that dyes hair. Divided into temporary, semi-permanent, permanent hair dye. Hair dyes generally contain p-phenylenediamine as a carcinogen. Experts say that p-phenylenediamine is a colorant that must be used in hair dyes and is an internationally recognized carcinogen.

Hair dye

Hair dyeing has become a fashion choice for people. According to a CCTV international network survey, more than 90% of the 2,600 people surveyed have dyed their hair, and those who started to dye their hair before the age of 30 accounted for the survey About half.

Chinese name: Hair dye
Foreign name: hair dye
Nature: A cosmetic that dyes hair

Classification: Temporary, semi-permanent, permanent hair dye
Background: The pace of life in today's society is fast and work is stressful
status quo: Increased gray hair and hair loss due to stress and busyness
Ingredients: Chemicals such as p-phenylenediamine

Hair dye introduction

Hair dye cosmetics have the effect of changing the color of the hair, commonly known as hair dye. Chinese people belong to the yellow race, mostly white hair and black are the beauty, so the hair dye is also monotonous. Europeans and Americans are accustomed to blushing or bleaching their hair first, and then dyeing their hair into gold, yellow, linen, reddish brown, violet, etc., so their hair dyes come in many varieties. Since the reform and opening up, due to the influence of international popular hair color, China has also introduced various color hair dyes, which has made China's hair color market shine.

In the 21st century, China will enter an aging society. As the number of silver-haired people gradually increases, the market demand for hair dye products will increase. Moreover, in today's society, the pace of life is fast, work is intense, and gray hair and hair loss caused by stress and busyness have increased significantly, which has brought a huge market for hair dyes. ^[1]

Temporary hair dye

Temporary hair dye is a hair dye that only needs to be washed once with shampoo to remove color on the hair. Due to the large size of these hair dyes, they cannot enter the hair shaft through the epidermis, but only deposit on the surface of the hair to form a colored covering layer. In this way, the interaction between the dye and the hair is not strong, and it is easy to be washed away by the shampoo.

Hair dye semi-permanent hair dye

Semi-permanent hair dye generally means that it can withstand 6-12 shampoo washing before it fades. Semi-permanent hair dye is applied to the hair. After staying for 20-30 minutes, it can be washed with water to color the hair. Its working principle is that relatively small molecular weight dye molecules penetrate into the epidermis of the hair, and partially enter the cortex, making it more resistant to shampooing than temporary hair dyes. Since the use of hydrogen peroxide does not damage the hair, it has become popular in recent years.

Permanent hair dye

There are three types of permanent hair dyes: plant permanent, metal permanent, and oxidative permanent.

1. Permanent plant:

Staining with substances extracted from the flowers, stems and leaves of plants is expensive and is still rarely used in China.

2. Permanent metal:

Metallic materials are used for dyeing. The dyeing is mainly deposited on the surface of the hair. The color has a dull metallic appearance, which makes the hair brittle and the efficiency of the perm lower.

3. Permanent oxidation:

The mainstream product on the market, it does not contain the so-called dyes, but contains dye intermediates and coupling agents. After these dye intermediates and coupling agents penetrate into the hair's cortex, oxidation reactions, coupling and condensation reactions occur. The dye molecules are enclosed within the hair fibers. Due to the different types of dye intermediates and coupling agents and the difference in content ratios, reaction products with different hue are produced. The various hue products are combined into different hue to make the hair dye different colors. Because the dye macromolecules are generated in the hair fiber through the reaction of the dye intermediates and the coupling agent small molecules. Therefore, the dye macromolecules formed during washing are not easily washed through the pore diameter of the hair fibers.

There are different types of hair dyes depending on the color

The dangers of hair dye

The hair dye contacts the skin, and in the process of hair dyeing, it also needs to be heated, so that benzene organic substances enter the capillaries through the scalp, and then reach the bone marrow with the blood circulation. It repeatedly acts on hematopoietic stem cells for a long time, leading to the malignant transformation of hematopoietic stem cells, leading to occur. One of the reasons why hair dyes cause skin irritation, leukemia and other diseases is because the hair dye contains a chemical called p-phenylenediamine. ^[2]

Hair Dye Selection

It is understood that there are many types of hair dyes on the market, and some products are advertised as "pure Chinese herbal preparations", "non-toxic side effects without hair dyes", "pure natural plant extracts, whitening and giving heart and health", all claiming to be able to To the effect of fast hair coloring, many white hair rush to buy and use, which caused a lot of complaints. When dyeing and using hair dye, pay attention to:

Hair dyes should be selected from regular shopping malls or hair salons with well-packaged and clearly labeled products with production licenses, sanitary licenses, special cosmetics approval numbers and product product standard numbers; imported products should be marked with imported cosmetics hygiene approval numbers, Chinese Product names, manufacturer names, addresses, and names and addresses registered by distributors, etc., reject fake and shoddy products.

If you go to a hair salon to dye your hair, you should choose a legal, regular, reputable, hairdresser with a qualified hairdresser. To prevent the application of hair dye to the skin when dyeing hair, apply a layer of protective product to the skin first. If consumers dye their own hair, they must wear gloves to avoid direct skin contact with the hair dye. After dyeing the hair, the hair and scalp should be thoroughly cleaned, and do not scratch it with force when washing to avoid scalp injury and poisoning or infection.

It is worth noting that citizens should not use hair dyes more than six months after opening the bottle, and the interval between two hair dyeings should be more than 3 months. Do not use products of different brands at the same time, because they may produce chemical reactions between them, generate toxic substances, and increase the chance of allergies.

Consumers should obtain and retain vouchers for shopping when receiving hair dyeing services. The shopping voucher should include the product name, specifications, quantity, price and other contents. Once there is a quality problem, you can negotiate with the manufacturer based on the voucher, or complain to the relevant departments such as the Consumer Council to protect your legitimate rights and interests.

Experts recommend that you don't dye your hair too many times, up to three times a year, and only dye new hair. One to two weeks before dyeing, intensive hair care can reduce damage to the hair and make it easier to color. One week before dyeing your hair, do not use a shampoo that is a combination of shampoo and conditioner, or hair conditioner, or conditioner and conditioner. These products will form a protective film on the outside of the hair and block the entrance of the dye. A deep cleansing shampoo. In addition, try not to wash your hair two days before dyeing, let the hair secrete oil, and form a natural protective film to protect the hair follicles. A local allergy test is also done 48 hours before dyeing.

Experts remind you not to use different hair dyes to dye your hair at the same time, because there may be chemical reactions between the hair dyes; after dyeing your hair, wash it a few times to avoid leaving the hair dye on your hair. When washing your hair, do not scratch your scalp with your fingers to avoid causing poisoning; within two weeks after dyeing, you should continue to care for your hair, supplement the protein and moisture lost from the hair, and make your hair more shiny. Especially for hair with relatively thin hair, you should choose a conditioner with more protein after dyeing.

Hair dye expert advice

Experts recommend not to dye hair more than twice a year. Patients with hypertension, heart disease, asthma and other diseases should not dye hair. In addition, couples planning to give birth, pregnant women and lactating women are also not suitable for hair dyeing.

Long-term use of hair dye is harmful to your health. American experts examined 160 popular hair dyes and found that 150 of them have carcinogenic effects. For example, in oxidative hair dyes, there is a substance called 2-4 aminoanisole, which is most likely to accumulate in the human body and promote cell proliferation. Under normal circumstances, if the hair dye is used for 10 years, as long as the skin absorbs 1% of this substance, it can cause cancer.

In addition, the use of hair dyes can cause immune disorders in the body and cause lupus erythematosus. Other hair dyes can cause allergic dermatitis and allergic ocular conjunctivitis. Accordingly, scientists caution people to use hair dyes with caution.