Process of direct hair dyeing using sulphonic groups containing dyes and steam.

摘要

The invention relates to a process for the direct dyeing of keratinous fibres, which consists in bringing keratinous fibres, to which a composition containing at least one direct dye bearing at least one sulphonic function has been applied, into contact with a gas containing water vapour, the temperature of the aforementioned gas being above 75 DEG C and the contact time between the aforementioned gas and the aforementioned fibres to be dyed being less than two minutes. This process enables excellent dyeing results to be obtained in extremely limited times and without risk of staining the skin or scalp.