Method for hair shaping treatment that is hair straightening treatment or permanent waving treatment, and hair treating liquid for hair shaping treatment
The present invention relates to a method for hair shaping treatment which reduces the damage sustained by hair during hair shaping treatment such as hair straightening treatment and permanent waving treatment. The method comprises applying a first agent containing a reducing agent to hair, and leaving the hair for a predetermined period of time； washing off the first agent applied to the hair； applying a second agent containing an oxidizing agent to the hair, and leaving the hair for a predetermined period of time； and washing off the second agent, wherein the hair shaping treatment method further comprises the step of: spraying a gold nanocolloid liquid containing gold nanoparticles to the hair prior to application of the second agent, wherein the gold nanoparticles in the gold nanocolloid liquid have a concentration in the range of 0.0001 mass% to 0.01 mass%.
