Process for the oxidative dyeing of hair

A process for the oxidative colouring of hair based on a colorant compound F containing a combination of a developer and coupler which is used after mixing with an oxidising agent in which, in a first step, the colorant compound F is mixed with a preparation A containing an oxidising agent and then the mixture FA obtained is applied to the new hair and allowed to work and, in a second step, the colorant compound F is mixed with a preparation B containing an oxidising agent and the mixture FB thus obtained is applied to the existing hair and tips and allowed to work, preparation B having a more acid pH value than preparation A, and finally the hair is rinsed with water, post-treated if necessary and then dried. The novel hair colouring process gives an excellent colour match between the new hair, the existing hair and the tips and good hair colouring permanence.