A colourless or only slightly coloured pigment dispersing agent which can be used to disperse pigments having various hues, and which has the general formula (1) wherein k is from 1 to 3, 1 is from 0 to 2, R1 is an amino group, R2 is a halogen atom, an amino group, a nitro group, a hydroxyl group, an alkoxy group, a carboxyl group, a sulfonic acid group, an optionally substituted alkyl group or an optionally substituted alkenyl group, X1 is -O- or -NR3- wherein R3 is a hydrogen atom, an optionally substituted alkyl group or an optionally substituted alkenyl group, Y1 is a amino derivative and Y2 is an amino derivative, a hydroxyl group, an alkoxy group or a group wherein X1, R2, R2 k and l are defined above.rsin