Every time you wash your hair with hot water, gently rub it with conditioner, it is easy to fade, because hot water is easy to dissolve things, just like washing dishes with hot water to remove grease. The conditioner itself has the function of caring hair, but your coloring book is not good for hair, so using the conditioner has a certain desalination effect. In fact, if you persist for half a month, your hair will soon fade ... but it is natural to have a little yellow left.
2, natural fading.
Often wash your hair with alkaline shampoo, hair dryer and ultraviolet radiation, there are fading phenomena, and the fading of 1 degree is still a natural fading phenomenon.
3. Use hydrogen peroxide.
Too strong concentration of hydrogen peroxide will fade. For example, if 9% or more hydrogen peroxide is used to cover white hair, the dyed color will be lighter than the target color. Because more than 6% of hydrogen peroxide itself contains fading rate, and white hair itself has no natural pigment, it will cause the artificial pigment of dye paste to fade. In addition, more than 9% hydrogen peroxide has a strong expansion rate on hair, so the percentage is high and the color fades quickly.
4. After dyeing your hair, you find that the color is a bit heavy. Washing your hair with some cola can help you fade the color.
Extended data:
Harm of hair dyeing
Secondary amine can easily react with epoxy, aldehyde and acid gas, and can be used as dye fixing agent to stabilize the adhesion effect of dyes. It can penetrate into skin and hair and stay for weeks, months or even years, and react with tobacco smoke or waste gas in the air to generate nitrosamines, which are a strong carcinogenic chemical.
It is reported that hair dyes are associated with a series of cancers, including breast cancer, bladder cancer, uterine cancer, brain cancer and leukemia. As early as 2009, a woman in Britain was at risk of blood cancer because she used hair dye more than 9 times in a year. A year later, the European Commission banned 22 hair dye products that may cause bladder cancer.
Hair dyes also contain heavy metal salts. Once it enters the human body, it is difficult to excrete it. If it accumulates in the body for a long time, it will cause poisoning, dizziness, headache, fatigue, numbness of limbs and other poisoning symptoms, and may enter the liver, kidney and brain, destroying the functions of these organs.
Experts suggest that it is best not to dye your hair. If you need to dye your hair, the interval between dyeing your hair should be at least 3 months, preferably in a professional barber shop. Do not bake oil one week before dyeing, and do not wash your hair on the day of dyeing. The oil secreted by scalp has protective effect; If the scalp has a wound ulceration, it is not suitable for dyeing hair; Do a skin allergy test 48 hours before dyeing hair; Before dyeing hair, you can apply emulsion or vaseline to the hairline and behind the ears to prevent the hair dye from contacting the skin and causing damage. If the scalp has slight adverse reaction when dyeing hair, it should be stopped immediately.
If you wait in a smoky environment for a long time after dyeing your hair, you should wash your hair frequently and remove the harmful substances adsorbed on your hair in time. It's best to wear a hat when traveling in foggy days, and take off your coat immediately after entering the house to reduce the harm of dirty outdoor air to your body.
Reduce harm
1, dye your hair no more than twice a year.
2. It is best to be at least 1-2 cm away from the scalp.
3. After dyeing your hair, wash it thoroughly and wash off all the dyed substances.
4. Don't scratch your scalp after dyeing your hair, it's easy to get infected.
References:
Baidu Encyclopedia: Hair Dyeing