Abstract: Trisazo dyes of the general formula I ##STR1## where R.sup.1 is hydrogen, C.sub.1 -C.sub.4 -alkyl, halogen, nitro, hydroxysulfonyl, sulfamoyl, mono- or di-C.sub.1 -C.sub.4 -alkylsulfamoyl, C.sub.1 --C.sub.4 -alkylsulfonyl or C.sub.1 -C.sub.4 -alkoxysulfonyl,R.sup.2 is hydrogen, halogen, nitro or hydroxysulfonyl, at least one of R.sup.1 and R.sup.2 being nitro,R.sup.3 and R.sup.4 are each independently of the other hydroxyl or amino,R.sup.5 is hydrogen, C.sub.1 -C.sub.4 -alkyl, hydroxysulfonyl, sulfamoyl, mono- or di-C.sub.1 -C.sub.4 -alkylsulfamoyl, C.sub.1 -C.sub.4 -alkylsulfonyl, C.sub.1 -C.sub.4 -alkoxysulfonyl or carboxyl,R.sup.6 is hydrogen or C.sub.1 -C.sub.4 -alkyl,R.sup.7 is hydrogen, C.sub.1 -C.sub.4 -alkyl, hydroxysulfonyl, sulfamoyl, mono- or di-C.sub.1 -C.sub.4 -alkylsulfamoyl, C.sub.1 -C.sub.4 -alkylsulfonyl, C.sub.1 -C.sub.4 -alkoxysulfonyl, SO.sub.2 N(CH.sub.2 COOH).sub.2 or carboxyl,R.sup.8 is hydrogen, C.sub.1 -C.sub.4 -alkyl, hydroxyl, C.sub.1 -C.sub.

Abstract: A tetrakisazo compound represented by the following formula (1) in the free acid form: ##STR1## wherein Q.sub.1 and Q.sub.2 independently represent phenylene or naphthylene group which may be optionally substituted, R.sub.4, R.sub.5 and R.sub.6 independently represent a hydrogen atom, a halogen atom, a hydroxy group, a sulfonic acid group or an amino, alkyl, alkoxy, carbamoyl or sulfamoyl group which may be optionally substituted, m is 0 or 1 and n is 1 or 2, and an ink which comprises the tetrakisazo compound. The ink exhibit excellent properties for ink jet printing.

Abstract: Disclosed herein is an azo compound represented by the formula ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 each are a group or atom selected from the group consisting of a hydrogen atom, alkyl groups having 1 to 4 carbon atoms, a methoxy group, halogen atoms, COOM and COOR.sub.4 in which R.sub.4 is an alkyl group having 1 to 4 carbon atoms, and M denotes an alkali metal atom, or an ammonium or organic ammonium ion. An ink containing this compound is suitable for use in an ink-jet recording.

Abstract: An ink comprising: water, a water soluble organic solvent, and a colorant represented by the following general formula (I): ##STR1## wherein Q1 is a substituted phenyl group; Q2 is a substituted or unsubstituted p-phenylene or a substituted or unsubstituted 1,4-naphtylene group; Q3 is a substituted phenyl group; M is an alkali metal, ammonium or an organic ammonium; and n is 0 or 1, and wherein said colorant has at least a sulfone group and a carboxyl group and the number of said sulfone groups is not greater than the number of said carboxyl groups. Such an ink may be used for an ink jet recording.