| abstract |
A permanent hair dyeing method comprising performing a plurality of treatments on a hair with a set time interval between each two successive treatments, wherein each treatment comprises the following steps (a) and (b): (A) (i) an alkaline composition comprising a dye intermediate in a shampoo or conditioner base, and (ii) an acidic composition comprising an oxidizable compound in a shampoo or conditioner base; Contacting the hair with the freshly prepared mixture from for a period of about 5 seconds to about 5 minutes; (B) rinsing the mixture from the hair with water; Consisting of When a conditioner base is present in the composition (a) (i), an independently selected conditioner base is also present in the composition (a) (ii). (I) when a shampoo base is present in the composition, an independently selected shampoo base is also present in the composition (a) (ii); The method is described, wherein the number of times of the processing is about 2 to about 30 times, and the set time interval between each of the two successive processings is about 8 hours to 30 days. . |