| abstract |
The present invention relates to a method to achievena reversible change of the colour of hair dyed with an azondye wherein the change of the colour can be effected by,nfor example, the salonist or the consumer in a simplenmanner. n The colour of the hair thus dyed may be changednsimply by treating the dyed hair with an acid treatmentncomposition at any time after the first dyeing treatment.nIf desired by the consumer, the colour may be returned tonsubstantially the original post dye colour by treating thenhair further with an alkaline treatment composition. |