Process For Dyeing Keratin Materials Using Powder From Indigo Producing Plants And Alkaline Agent(s)

Abstract: The invention relates (I) to a process for dyeing keratin materials in particular keratin fibres preferably human keratin fibres such as the hair using i) indigo producing plant powder ii) at least one alkaline agent as a post treatment preferably an alkali metal or alkaline earth metal (bi) carbonate and iii) optionally a chemical oxidizing agent such as hydrogen peroxide or a hydrogen peroxide generating system in co treatment with i) and it being understood that the composition comprising the alkaline agent(s) is at a pH inclusively between 7.5 and 11.5; and (II) to the use iii) of alkaline agent(s) for fixing the blue colour of and/or for improving the dyeing kinetics of keratin materials dyed with indigo.

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