What is the principle of hair coloring?

Hair coloring principle is:

Because the scales on the hair will open up when encountering alkali, the principle of hair coloring is to use the alkaline ingredient in the hair coloring cream to open up the scales on the surface of the hair, and then let the artificial pigment enter into the cortical layer of the hair, and combine with a part of the natural pigment, and finally form the desired color.

Chemical hair coloring changes the hair's own structure and corrodes the scalp in a process where ammonia corrodes and attacks the hair follicles. Plant hair coloring is a physical process, nourishing elements like a film attached to the hair and scalp, nourishing and caring for the hair, nourishing hair follicles. Like a cut apple will have an oxidized film covering the apple, plant hair coloring is the use of physical oxidation process to make the nourishing elements attached to the hair and scalp.

Be sure to do a skin test before coloring your hair:

Be sure to keep your hair clean and dry before coloring it, and don't do any special treatments such as baking oil for a week before coloring your hair; it's best to wash your hair the day before coloring it; and don't use styling products on the day of the coloring.

Before you start coloring your hair, comb it through and smooth it out. When coloring your hair, there is no need to use a comb, so please use your fingers to massage your head thoroughly until the hair coloring milk is evenly distributed on each strand of hair.

After the hair dye is evenly distributed on the hair strands, do not cover or wrap the hair, make sure to let the hair spread freely so that it can fully contact with the air and let the coloring ingredients work to their fullest potential.

Reference: Baidu Encyclopedia - Hair Dye?

The above content refers to: Baidu Encyclopedia - Hair Dye?