this type according to the present invention conform to the general formula iba t 1 is nitro t 3 is hydrogen cyano chlorine or bromine t 4 is hydrogen cyano nitro chlorine bromine or trifluoromethyl r 1 is hydrogen hydroxyl methyl acetylamino or propionylamino r 2 is hydrogen chlorine methyl or methoxy r 3 is hydrogen methyl ethyl butyl or allyl the dyes of the general formula i according to the present invention can be prepared by methods known to one skilled in the art for instance a compound of the general formula iii where d is as defined above is diazotized and coupled onto a compound of the general formula iv where r 1 to r 6 x m and n are each as defined above the compounds of the general formula iii are generally diazotized in a known manner for example with sodium nitrite in an acidic aqueous medium for example in an aqueous medium rendered acidic with hydrochloric acid or sulfuric acid or with nitrosylsulfuric acid in dilute sulfuric acid phosphoric acid or a mixture of acetic and propionic acids the preferred temperature range is between 0 u00b0 c and 15 u00b0 c the diazotized compounds are generally likewise coupled onto the compounds of the general formula iv in a known manner for example in an acidic aqueous aqueous organic or organic medium with particular advantage at temperatures below 10 u00b0 c acids used are in particular sulfuric acid acetic acid or propionic acid the compounds of the general formulae iii and iv are known and can be prepared by known methods the dyes of the.