The present invention relates to a process for treating keratin fibres, in particular the hair, comprising the application of at least one makeup-removing composition to said keratin fibres, which have been dyed beforehand using at least one dye composition comprising at least one particular silicone of formula (I) and at least one colouring agent chosen from pigments, direct dyes and mixtures thereof, said makeup-removing composition comprising a) at least one alkaline agent.