Why does hair dye turn yellow after fading? Difference between healthy hair and damaged hair.

1, in fact, just because almost any color is dyed, it will turn yellow after a while. The color of those hair creams should be based on yellow. The process of dyeing hair can be divided into two steps, fading and color retention.

2. The difference between healthy hair and damaged hair: healthy hair has compact structure, and the pigment dyed into hair has strong stability and slow fading speed. The damaged hair has loose structure and poor color stability, so the fading speed will become faster. When dyeing hair, artificial pigments enter the hair and mix with natural pigments to form new colors. The closer the combination of the two, the better the color stability. When the hair is damaged and the structure is slack, the artificial pigment in the hair dye is not closely mixed with the natural pigment, and the color stability is not good. The closer the fusion, the more stable and loose the color, and the worse the color stability.