Classification and characteristics of hair dyes;
Chemical hair dye
Advantages: simple operation. Chemical hair dyes may dye hair according to their favorite colors and shades, thus diversifying hair colors. Moreover, when dyeing, artificial pigments invade the hair, and the artificial hair color has the same tone, basically no color difference, and it is not easy to be washed away and faded.
Disadvantages: The pigment contained in the chemical hair dye itself will cause skin allergies. Before dyeing, mix the two kinds of dye pastes that react chemically. They act on the scalp of hair for a long time and are more likely to invade the skin and cause harm.
semi permanent hair colorants
Advantages: Semi-permanent or temporary hair dyes without adding hydrogen peroxide are much less toxic than permanent chemical hair dyes and less harmful to hair.
Disadvantages: the color retention time is slightly shorter than that of chemical hair dyes, and the hair color will fade after dyeing, and the hair color will return to its original appearance after about 4-6 weeks. Moreover, semi-permanent hair dyeing may also cause skin allergies, mainly because some pigments can not be firmly adsorbed on the hair, and every time you wash your hair, discoloration has a bad effect on the scalp, causing allergies.
Natural hair dye
Advantages: The plant hair dye is extracted from natural pigments, such as henna, chamomile, indigo, coffee powder, etc. It usually does not damage the hair structure and stored pigments.
Disadvantages: Because the effect of plant hair dye is unpredictable. The level, delicate change and intensity of color are closely related to the hair quality of all kinds of hair, so it is necessary to find an experienced colorist to dye satisfactory colors.
Traditional Chinese medicine hair dye
Traditional Chinese medicine hair dyeing is the latest concept of hair dyeing, which is only available in large hair salons and health clubs. According to one's hair quality and original color, natural materials such as black sesame, dried watermelon peel, Polygonum multiflorum Thunb, fresh eggs, vinegar and vegetable oil are used to make a "dyed paste". The principle of this traditional Chinese medicine hair dyeing is to extract the plant pigment of Chinese herbal medicine through vinegar, and then cover the pigment on the hair through the attachment of egg white. However, this hair dyeing method is mainly based on hair care, so the color is limited, but it will be better to cover the white hair than to dye the popular color.
Traditional Chinese medicine hair dye has the advantages of maintaining hair, supplementing nutrition and not hurting hair, but it has the disadvantages of too few colors and easy fading, which is not ideal only from the essential purpose of hair dyeing.