Hair dyeing principle

Because the scales on the hair will open when it meets alkali, the principle of dyeing hair is to use the alkaline components in the hair cream to open the scales on the hair surface, and then let the artificial pigments enter the cortical layer of the hair and combine with some natural pigments to finally form the desired color.

Hair dyeing is usually divided into the following steps:

First, the hair softens under the action of alkali and water, and the hair scales open, usually about 10 minutes;

Then the color of the dye paste penetrates into the inner layer of the hair, usually about 30 minutes;

Dyed pigment molecules are oxidized to synthesize pigment ions, and the effect is generally 40-50 minutes.

The process of dyeing hair is actually to dilute the original pigment in the hair, and at the same time put the artificial color into the hair, so that the dyed ions can combine with the natural color ions of our hair to make the hair look the desired color. Even if it is the same color, the hair color in different people's hair will not be the same, because the natural background color of each person's hair is different, so the final effect is different.