Abstract: The present invention relates to non-elicited dedifferentiated plant cells of a plant of the species Lavandula angustifolia, or extracts thereof, and also to the cosmetic composition comprising same, to the uses thereof and to cosmetic treatment processes comprising the application of said composition to the skin for improving and/or reinforcing the barrier function, and also for improving the moisturization of the skin.

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.