A process according to claim 1, wherein the water-based dispersion of the organic pigment is obtained by mixing and dispersing the organic pigment with and in the water-based liquid together with a compound of the formula (1), P--[X--Y--Z--N(R1)R2 ]n ( 1) wherein P is an organic dyestuff residue, a heterocyclic ring residue or an aromatic polycyclic compound residue, X is a div