The present invention is related to a process for colouring and permanent shaping keratin fibres especially human hair in a single process.The novel process for colouring and permanently shaping keratin fibres especially human hair according to the present invention includes the following steps:a- an aqueous colouring composition based on at least one hair direct dye and not comprising any oxidative dye precursors and/or couplers is applied onto hair and rinsed off from hair with water after processing 1 to 45 min at a temperature of 20 to 45°C and towel dried,b- the towel dried hair is put on curlers,c- an aqueous composition comprising at least one reducing agent is applied onto hair and rinsed off from hair with water after a processing time of 2 to 30 min at ambient temperature and towel dried,d- a composition comprising at least one oxidizing agent is applied onto hair processed for 2 to 15 min and curlers are taken off from hair and optionally rinsed off from hair with water and optionally towel dried, ande- an aqueous colouring composition based on at least one hair direct dye is optionally mixed with a composition comprising at least one oxidizing agent and applied onto hair and rinsed off from hair with water after processing 5 to 45 min at a temperature of 20 to 45°C and towel dried and dried with a dryer or left to dry in the air.
