Self-staining step

1. Dye the hair 3 cm away from the top of the hair first.

2. Dye all your hair in the second half and wait for 20 minutes.

3. Dye the top of your hair and carefully cover all your hair with dye foam.

4. Put all the hair into the plastic hair cover and wait for 30 minutes.

After 5.30 minutes, remove the hair cover.

6. Dyeing your hair is successful only after using conditioner and washing your hair dry.

Extended data:

Precautions and hazards of daily hair dyeing:

First, matters needing attention:

First of all, it is recommended to minimize the number of hair dyes, and the number of hair dyes should not exceed two times a year. It's best not to perm and dye your hair at once.

Secondly, use regular and safe hair dye when dyeing hair, and pay attention to whether the package is marked with "p-phenylenediamine" and the concentration of PPD in the hair dye. The maximum allowable concentration of PPD in China is 6%.

Thirdly, before dyeing hair, you can protect and isolate it by not washing your hair or applying a small amount of vaseline oil on your scalp. If necessary, you can do a skin test to see if the scalp is allergic. If there is no allergic reaction, consider dyeing your hair.

Finally, wash your hair immediately after dyeing, and clean up the ingredients of the hair dye, so as not to leave the hair dye products on your hair.

Second, the harm

Hair dyes contain carcinogen p-phenylenediamine, and normal brand hair dyes have been tested by relevant state departments. If the content of p-phenylenediamine is within the national standard, it will not cause cancer if used properly.

However, if hair dyes from unknown sources or fake hair dyes are often used, the p-phenylenediamine in them is likely to exceed the standard seriously, and long-term use will definitely endanger human health. In addition, chemicals contained in hair dyes, such as mercaptoacetic acid, will damage hair, scalp and hair follicles during dyeing, which will reduce the oil secretion of hair, make hair brittle and brittle, and lose luster.

People's Network-How to dye your hair safely?