Abstract: A water-soluble dye, free from cellulose reactive groups, of the formula: ##STR1## wherein each of Ar.sup.1 and Ar.sup.2, independently, represents an optionally substituted phenyl or naphthyl radical,each of R.sup.1 and R.sup.4, independently, represents --OR.sup.5 or --NR.sup.6 R.sup.7,R.sup.5 represents hydrogen or alkyl,R.sup.6 represents hydrogen, alkyl, aryl or a radical of the formula --(C.sub.a H.sub.2a O).sub.m (C.sub.b H.sub.2b O).sub.n H,R.sup.7 represents hydrogen, alkyl, aryl, a radical fo the formula --(C.sub.a H.sub.2a O).sub.m (C.sub.b H.sub.2b O).sub.n H or a radical of a mono- or disazo dye, orR.sup.6 and R.sup.7 together form a morpholine ring,a and b are different integers from 1 to 8,m is an integer from 1 to 10,n is an integer from 0 to 9,each of R.sup.2 and R.sup.3, independently, represents hydrogen or alkyl,M represents hydrogen, ammonium or a monovalent metal, and each of p and q, independently is an integer from 1 to 3.The dyes are suitable for use in ink jet printing.