Hair dyeing is one of the most common means of modern makeup. It uses plant (such as oil pear, nail grass, Polygonum multiflorum, etc.) or chemical pigments to dye the hair color into the desired color. It is one of the most common services in modern barbershops.
There are two main purposes of hair dyeing: one is to dye black to cover up white hair; the other is for fashion, changing the color of the hair according to the mood, and matching the clothes and makeup to fully show one's personality. Hair dyeing has become a fashion. Young people can change the color of their black hair according to their mood, and match their clothes and makeup to fully show their individuality. However, middle-aged people have to dye black frequently due to the continuous growth of white hair.