an ink jet printer that is responsive to digital data signals b loading the printer with ink receptive substrates c loading the printer with an ink jet ink composition comprising a carrier and a polyvalent transition metal complex of an 8 heterocyclylazo 5 hydroxyquinoline and d printing on an ink receptive substrate using the ink jet ink in response to the digital data signals application_number US 20325898 A description in a preferred embodiment of the invention the polyvalent transition metal complexes of an 8 heterocyclylazo 5 hydroxyquinoline employed have the following general structure str1 wherein each x y and z independently represents a substituted or unsubstituted alkyl group of 1 6 carbon atoms a substituted or unsubstituted aryl group of 6 10 carbon atoms a substituted or unsubstituted hetaryl group of 5 10 atoms halogen cyano nitro a substituted or unsubstituted alkoxycarbonyl group of 1 6 carbon atoms a substituted or unsubstituted alkoxy group of 1 6 carbon atoms hydroxy a polyoxyalkylene group of 2 20 alkylene oxide residues carboxy or a salt thereof sulfo or a salt thereof phospho or a salt thereof carbamoyl a substituted or unsubstituted alkyl aralkyl aryl diaryl or dialkyl carbamoyl group of 1 20 carbon atoms sulfamoyl a substituted or unsubstituted alkyl aralkyl aryl diaryl or dialkyl sulfamoyl group of 1 20 carbon atoms acylamino sulfonylamino amino a substituted or unsubstituted alkyl aralkyl aryl diaryl or dialkyl amino group of 1 20 carbon atoms or a quaternary ammonium or phosphonium group q represents the atoms necessary to complete a 5 or 6 membered heterocyclic ring two or more of l may be joined together to form a bi or tridentate ligand which may optionally comprise another polydentate molecule of the same or different structure as shown above one or more of l may be.