Hair dye is composed of various chemical components. According to the investigation of relevant departments, nearly 90% of hair dye contains nitrobenzene, aniline and other toxic chemicals. These chemicals are also easily absorbed by the skin, causing harm to the human body. According to medical experts, long-term use of hair dye, as long as 1% of harmful substances are inhaled into the skin, it will produce poisoning. The combination of chemicals in the hair dye and skin cells will cause cell mutation, and then induce skin cancer, leukemia and other diseases.
Some problems caused by hair dye:
1. Skin allergy is the most common problem in hair dyeing. Many people may not have allergies when they attend hair dyeing, but after many times of hair dyeing, they will have allergic reactions, and the longer the time, the higher the chance of allergies.
2. It will change the quality of your hair. If you dye your hair, it will make the water in your hair unbalanced, and a lot of protein will denature and reduce. Make hair brittle, fiber fracture, loss of natural softness. The more times, the greater the damage.
3. It will cause hair loss. The stimulation of hair dye will make the scalp and hair follicle inflamed. After a long time, it will atrophy. The hair will become thinner and thinner, which is better to cause hair loss.
In general, all kinds of chemicals contained in hair dye will have some effect on the body. However, different types of hair dyes do different harm to the body.
There are many types of hair dyes, which can be divided into temporary, semi permanent and permanent according to the duration. Sustainability is directly proportional to its harmfulness. Let's see how harmful hair dyeing is to the body
Temporary hair dyes
Function characteristics: it is mainly composed of some macromolecular dyes, which can only be attached to the hair surface and cannot enter the hair interior.
Duration: easy to be cleaned, only lasts for 4-7 days.
Effect: the possible effect on the body is skin allergy (of course, the incidence is also low).
But it will not damage the hair quality, not easy to penetrate the skin, and has high safety.
Semi permanent hair dye
Function characteristics: small molecules, can penetrate into hair, and hair cuticle has a certain affinity.
Duration: easy to exude when shampoo. It can last nearly a month. If you wash your hair frequently, it will decolor faster.
Effect: it is possible to be allergic. Frequent use will have some effect on hair quality.
Permanent hair dyes
Function characteristics: instead of using dyes directly, it uses small molecules of colorless dye intermediates to penetrate into the hair, and the same oxidant and coupling agent penetrating into the hair will undergo oxidative polymerization reaction, which will turn into macromolecular dyes for coloring
Duration: these macromolecular dyes are difficult to exude, so they last for several months and are not easy to wash off.
Influence: because these 'intermediates' commonly used substances are phenylenediamines and aminophenols, which have strong toxicity to phenylenediamine by mistake, it is easy to cause allergy and contact dermatitis when contacting with skin, and some sensitive individuals even have asthma and dyspnea.
Therefore, it is suggested that those who use this kind of hair dye should do a micro test first.
People with allergic constitution, eczema, urticaria, asthma and rhinitis should be more careful.