A compound of formula I (MO3S)m1 -Q1 -(CH2 -(X1) -(y1)n1)o1 (I) wherein M represents a metal cation, quaternary N cation or H; y1 is a sulfonic or carboxylic acid or salt thereof; Q1 represents a pigment moiety; X1 is an aromatic group, a cyclo-hetero aliphatic group with at least one 5 atom or 6 atom ring or a hetero aromatic group with at least one 6 atom ring and which is not a phthalimido group; m 1 and n 1 independently from each other represent an integer from 0 to 2.5; and O1 is an integer from 0.05 to 4, or a compound of formula II (MO3S)m2 -Q2 -(CH2 -(X2) -(y2)n2)o2 (II) wherein: Q2 represents a 6, 13-dihydroquinacridone moiety of formula III: wherein A and D each independently represent a substituent selected from H, F, C I, C 1 -C 3 aIk Yl and C1-C3alkoxy M represents a metal cation, quaternary N cation or H; y2 is a sulfonic or carboxylic acid or salt thereof; X2 is an aromatic group, a cyclo-hetero aliphatic group with at least one 5 atom or 6 atom ring or a hetero aromatic group with at least one 5 or 6 atom ring and which is not a phthalimido group; m2 and n2 independently from each other represent an integer from zero to 2.5; and 02 is an integer from zero to 4 and a process for the preparation and use of such compounds.