How to choose hair dye
Relatively speaking, high-quality hair cream often does little harm to human body. Therefore, in the face of all kinds of hair dyes on the market, MM who wants to dye her hair must keep her eyes open and make a good choice!
There must be a regular production batch number.
Regular hair dyes have production batch numbers, and their safety has been evaluated by the Ministry of Health, and they have obtained the approval number of special-purpose cosmetics in People's Republic of China (PRC) and the approval number of the Ministry of Health in China. The batch number should be Wei Zhuang Te Zi (200×)No. 00×××××, with the approval number of health permit. Products without the above batch number are illegal products, so consumers should not buy them.
Try to buy famous brands.
There are many manufacturers and brands of hair dyes. Although well-known brands of hair dyes are not completely without quality problems, compared with fake and shoddy hair dyes, large enterprises have relatively strict quality control over well-known brands of hair dyes.
Ask for relevant documents
China's Ministry of Health has formulated the List of Raw Materials for Hair Dyes (Trial) to standardize the quality of raw materials for hair dyeing products and ensure the safety of dyes to the greatest extent. Regular manufacturers will use p-phenylenediamine in strict accordance with this regulation. Regular manufacturers should have the approval number of cosmetics for special use of the Ministry of Health, and consumers are advised to ask for a copy of the approval when purchasing products.
Clear and complete identification
When buying hair dye, you should go to a regular shopping mall or supermarket. When you buy it, you should see if its packaging is complete. Don't buy it if it's not complete. Product identification should be clear. In addition to the production batch number and hygiene license number, the manufacturer, production address, product name, production date, safety warning, instruction manual and storage conditions that meet the shelf life and safety requirements should also be clearly marked.
Distinguish hair dyes with different properties
At present, there are hair dyes extracted from natural plants in the market. These hair dyes are relatively less toxic and have a lower incidence of allergies, but the hair dyes are lighter in color and have a shorter duration. Chemical hair dyes contain p-phenylenediamine, which is relatively effective, but it is easy to cause allergies and may cause cancer after long-term use. Therefore, consumers should pay attention to weigh the pros and cons when purchasing.
In addition, when choosing hair dyes, you should also pay attention to:
Chemical hair dye
Advantages: simple operation. Chemical hair dyes may dye hair according to their favorite colors and shades, thus diversifying hair colors. Moreover, when dyeing, artificial pigments invade the hair, and the artificial hair color has the same tone, basically no color difference, and it is not easy to be washed away and faded.
Disadvantages: The pigment contained in the chemical hair dye itself will cause skin allergies. Before dyeing, mix the two kinds of dye pastes that react chemically. They act on the scalp of hair for a long time and are more likely to invade the skin and cause harm.
Natural hair dye
Advantages: The plant hair dye is extracted from natural pigments, such as henna, chamomile, indigo, coffee powder, etc. It usually does not damage the hair structure and stored pigments.
Disadvantages: Because the effect of plant hair dye is unpredictable. The level, delicate change and intensity of color are closely related to the hair quality of all kinds of hair, so it is necessary to find an experienced colorist to dye satisfactory colors.
Traditional Chinese medicine hair dye
Traditional Chinese medicine hair dyeing is the latest concept of hair dyeing, which is only available in large hair salons and health clubs. According to one's hair quality and original color, natural materials such as black sesame, dried watermelon peel, Polygonum multiflorum Thunb, fresh eggs, vinegar and vegetable oil are used to make a "dyed paste". The principle of this traditional Chinese medicine hair dyeing is to extract the plant pigment of Chinese herbal medicine through vinegar, and then cover the pigment on the hair through the attachment of egg white. However, this hair dyeing method is mainly based on hair care, so the color is limited, but it will be better to cover the white hair than to dye the popular color.
Traditional Chinese medicine hair dye has the advantages of maintaining hair, supplementing nutrition and not hurting hair, but it has the disadvantages of too few colors and easy fading, which is not ideal only from the essential purpose of hair dyeing.
Temporary hair dyeing
This kind of hair dyeing can be called primary hair dyeing, and it can be removed only by washing with shampoo, because the hair dye particles are large and cannot enter the inner layer of the hair shaft through the surface layer, but are deposited on the scalp to form a color covering layer, which has no great interaction with the hair and actually does little harm to the scalp. You can try it boldly.
semi permanent hair colorants
Advantages: Semi-permanent or temporary hair dyes without adding hydrogen peroxide are much less toxic than permanent chemical hair dyes and less harmful to hair.
Disadvantages: the color retention time is slightly shorter than that of chemical hair dyes, and the hair color will fade after dyeing, and the hair color will return to its original appearance after about 4-6 weeks. Moreover, semi-permanent hair dyeing may also cause skin allergies, mainly because some pigments can not be firmly adsorbed on the hair, and every time you wash your hair, discoloration has a bad effect on the scalp, causing allergies.
Permanent hair dye
Permanent hair dyes are divided into three types: plant permanent, metal permanent and oxidation permanent. These dye intermediates and coupling agents can penetrate into the cortex of hair and undergo oxidation, coupling and condensation reactions to form larger dye components, which are actually wrapped in hair fibers.
Recommended brands of common hair dyes
L ' oreal Paris
L 'Oré al Paris is one of the most famous and oldest mass cosmetics brands of L 'Oré al Paris Group, which mainly produces hair dyeing, hair care, make-up and skin care products. Its outstanding quality has always been favored by women who love beauty all over the world, and L 'Oré al Paris also has the world's first non-toxic synthetic hair dye.
schwarzkopf, h. norman
As one of the three major hairdressing brands in the world, Schwartz is not only the first choice for hair stylists, but also won the trust of countless consumers. As we all know, Schwartz's "Blackhead" logo not only covers every product, but also appears in TV advertisements with great attention.
Gagnier
Canil is a natural beauty brand in Europe, as the second largest brand of L 'Oré al Group. Keep the original quality and efficacy of natural ingredients as much as possible. Canil hair dye is characterized by mild and low irritation, high quality but friendly price.
Na Wei
Na Wei is famous for its professional hair dyeing products. It is the second largest professional hair dyeing company in Europe, second only to L 'Oreal.
Plum Garden
Meiyuan Facai was developed by Japan HOYU Co., Ltd., and its color system in the mainland market is: natural black 88 1, brown black 882 and dark brown 883, with black as the main color, aiming at customers over middle age.
Matters needing attention in using hair dye
Avoid permanent hair dye
According to experts' statistics, nearly 90% of hair dyes contain toxic chemicals harmful to human body, such as nitrobenzene and aniline. Judging whether it is permanent hair dye or temporary hair dye depends on whether it changes color within 3-4 days after dyeing. Semi-permanent hair dye is decolored 1-2 days after dyeing, and permanent hair dye is decolored or not after two weeks. The darker the color of permanent hair dye, the greater the harm to human body.
48 hours skin test
Although the hair cream has been strictly tested, in order to protect our hair, we need to have an allergy test before dyeing it. Drop two kinds of hair dyes, A and B, on the same point on the inside of the wrist, and then wait for the hair dyes to air dry naturally. If there is redness and itching during the waiting process, it proves that the product cannot be used.
Hair care before dyeing.
Although when dyeing hair, the stylist added some skin care ingredients, so that hair dyeing and hair care can be carried out at the same time. However, in order to reduce the damage of hair dye to hair, hair care should be carried out 1-2 weeks before dyeing, especially for damaged hair. Hair care before dyeing can balance the slight acidity of scalp, increase the protection of hair scales and reduce the irritation of hair dye to hair.
Avoid repeating hair dyeing within three months.
Because the hair dye contains a decoloring agent, this decoloring agent will cause mountains and seas to the hair scales and become fragile and easy to break. If you dye your hair repeatedly within three months, it will cause heavy damage to the hair that has not yet recovered, and the consequences are unimaginable. The frequency of dyeing hair is controlled twice a year. If you want to keep the effect of dyeing your hair, you can make up the newly grown part.
Wash your scalp after dyeing your hair.
Don't scratch hard when washing to avoid scalp injury and poisoning or infection. If the skin feels itchy or painful when dyeing hair, stop immediately and rinse it with clear water. If you feel abnormal after dyeing your hair, you should seek medical advice immediately.
Do a skin test
48 hours before using the hair dye, drop two kinds of hair dyes, A and B, on the same point on the inside of the wrist, and then wait for the hair dye to air dry naturally. If there is redness and itching during the waiting process, it proves that the product cannot be used.
Mixed ointment
Take out two bottles of medicine from the box, then according to the length of your hair, squeeze a proper amount of ointment into the hair dyeing bowl, mix them according to the ratio of 1: 1, then mix them evenly and stir them repeatedly.
Dye the hair
Put on disposable gloves and start to apply the evenly mixed hair dye to your hair, dyeing it piece by piece. After applying, you can massage your hair properly to make the color more uniform.
Can frequent hair dyeing cause cancer?
The International Agency for Research on Cancer has evaluated the relationship between hair dyeing and cancer, and there is not enough evidence to prove that hair dyeing can cause cancer. However, many raw materials of hair dyeing products contain carcinogenic and allergic chemicals, and long-term frequent hair dyeing will really damage scalp and hair quality.