Hair dye is one of those single products that everyone uses in life. After all, many people will buy their own hair dye and DIY because the price has soared. However, due to the different hair lengths of the hair dyes used, many people have other problems, so the hair dye has been opened for more than half a year and cannot be the most concerned. YOGI Fine Chemicals, a hair dye wholesaler, will show you.
After opening the hair dye for more than half a year, it must not be used. Many friends and friends have hair dye. Since most of the hair dyes sold need to be mixed, they cannot be used after half a year.
Generally speaking, use the hair dye 15 minutes after mixing, otherwise the hair dye will deteriorate and lose its original hair dyeing effect. Hair dyes are cosmetics that dye hair. Hair dyes often contain p-phenylenediamine, a carcinogen.
In recent years, hair dye has become a fashionable choice for people. According to the CCTV international network survey, more than 90% of the more than 2,600 people surveyed have dyed their hair, and about half of them started dyeing their hair before the age of 30. How long does hair dye expire after opening? There's no major answer to how long hair dye will fail after it's been opened.
According to the specific situation, generally speaking, as long as it is well sealed, it can be reused. Whether the hair dye is in contact with the air for too long when it is first opened also determines whether the hair dye can be reused. In fact, you can tell whether it has deteriorated by looking at the color, which will change the color of over-oxidized hair dye.
It can be reused as long as there is no color change, lipid or hydrolipidic separation. The above is to use the hair dye when the hair dye has not expired. In addition, the shelf life of hair dye should be 3 years, so that it can be used within the specified time.
What should I pay attention to when using hair dye? 1. I suggest to choose a good hair dye cream, you can choose a pure natural ammonia-free hair dye, which can reduce the damage to the hair and body. 2. Do a skin check before dyeing your hair to see if you are allergic. If you have skin allergies, don't dye it. 3. When dyeing hair, check the scalp for wounds and scratches.
Finally, pay attention to whether the hair dye has expired. 4. When dyeing hair, try not to touch the scalp when applying the hair dye to avoid harmful substances remaining in the pores, which are harmful to the human body. 5. Wash your hair several times after dyeing, and try not to leave any smell of hair dye.
6. Hair dye must be kept well, and it cannot be sent to a place where children can easily get it, and it must be disposed of if it cannot be used up. 7. I suggest not to dye your hair too frequently, it is easy to cause damage to the hair and scalp when it is frequent. 8. Do not dye hair during pregnancy and breastfeeding, it is not good for children and adults.
9. After dyeing the hair, it is recommended not to perm or pull the hair, otherwise it will affect the dyeing effect.