1, different operation methods: hair dyeing is to dye your hair to the color you want on the basis of your original hair; Bleaching is to wash off the original pigment from hair with bleaching powder and hydrogen peroxide.
2. Use different materials: Hair dyeing mainly uses plants (such as avocado, henna, Polygonum multiflorum, etc.). ) or chemical pigments; Bleaching powder and hydrogen peroxide are mainly used to bleach hair.
3, the effect is not the same: generally speaking, bleaching hair can only bleach hair into light color, and there are many colors of hair dyeing, and there are many choices.
Second, dyeing hair and bleaching hair do similar harm to hair. Bleaching powder and hydrogen peroxide used for bleaching hair, hair dyes and potions used for dyeing hair are easy to cause hair quality problems and do great harm to hair.
Refer to Baidu Encyclopedia-Hair Dyeing
Reference Baidu Encyclopedia-Bleaching and Dyeing Hair