HAIR DYEING METHOD, OXIDIZING HAIRDYE COMPOSITION AND HAIR-DYEING TOOL

摘要

PROBLEM TO BE SOLVED: To provide a hair dyeing method, an oxidizing hairdye composition and hair-dyeing tools giving uniform color value in a bleached state between a dyed hair and a newly grown hair without damaging the hair. SOLUTION: In the case of the redyeing of hair after a definite period from the last dyeing treatment, the newly grown hair is coated with an alkaline oxidizing hairdye composition having a hydrogen peroxide concentration of 2-4 wt.% and an application pH of 9.5-11 and the previously dyed hair is coated with a slightly alkaline oxidizing hairdye composition having a hydrogen peroxide concentration of 0.5-1.5 wt.% and an application pH of 7.5-9.4. The applied oxidizing hairdye compositions are washed off after the lapse of a definite period at room temperature.