
While ancient dyes were made of plant and animal extracts, the evolution of the practice has seen the use of aggressive chemicals that can trigger allergic reactions and cause harm to users.
Hair colouring involves use of chemicals capable of removing, replacing, and/or covering up pigments naturally found inside the hair shaft. Typically, hair stylists apply bleach to remove melanin from the hair, and then ammonia and dye to penetrate the hair follicle and add permanent colour.
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