PROCESS FOR DYEING HAIR IN WHICH THE DEPTH OF SHADE IS GRADUALLY INCREASED IN SUCCESSIVE TREATMENTS

摘要

Human air is dyed in successive treatments at selected intervals with oxidation colors (aromatic primary amines and aminophenols) admixed in each treatment with an oxidizing agent (H2O2 or a derivative thereof) - the quantity of oxidation colorant applied in each treatment being substantially the same and the quantity of oxidizing agent being increased from the first to the last treatment to effect a gradual increase in depth of shade - the mixture being allowed to remain on the hair for substantially the same tine in each treatment, followed by removal by rinsing.