Bleaching hair is more complicated than dyeing it. Bleaching requires first applying a bleaching agent to the hair to make the color of the hair fade, and then applying a hair dye paste to re-dye the hair. Bleaching and dyeing are a little more damp, while dyeing only needs to apply a layer of hair dye cream to the hair and heat it with a machine.
Bleaching hair is much more serious than dyeing it. Bleaching can't be changed in a short time, but dyeing can be changed. There is a big difference between dyeing hair and bleaching hair. Dyeing hair means directly coloring with hair dye on the basis of original hair. Bleaching is to bleach the original hair color with bleaching powder and hydrogen peroxide, which is generally used as an auxiliary for dyeing hair and is suitable for dyeing dark or light hair. It depends on whether you need to bleach the dyed hair first. Bleaching is more harmful to hair than dyeing, because you have to fade to achieve the best dyeing effect.
Bleaching is to wash away the original melanin in hair, and dyeing is to cover the original hair color with the required color. In addition, the hair dyes used for bleaching and dyeing are different, and bleaching powder and hydrogen peroxide are used for bleaching. There are several degrees of hydrogen peroxide, and the speed of different actions is different, and the degree of damage to hair is also different. Hair cream is used to dye hair. In fact, most of the colors you see are dyed, and bleaching only plays an auxiliary role.
In order to highlight the strong texture and three-dimensional sense of hairstyle, bleaching hair will be used. Or when you need to dye a lighter color, you need to wash away the melanin in dark hair to achieve the best effect. Dyeing after bleaching and dyeing will make the dyed color more beautiful and pure. Bleaching brings chemical toxic substances into close contact with scalp, which can cause allergic reaction and allergic dermatitis.