Disazo containing diaminostilbene as diazo component and an aniline coupling component bearing a cationic alkyl ammonium group

A disazo dye of the formula ##STR23## in which R.sup.1, R.sup.2, R.sup.3 and R.sup.4 independently of one another are each an unsubstituted alkyl radical, an alkyl radical which is substituted by hydroxy, cyano, phenyl or alkoxy or R.sub.1 and R.sub.2 together with the nitrogen atom linking them are a pyrrolidine, piperidine morpholine or piperazine radical, or R.sup.1, R.sup.2 and R.sup.3 together with the nitrogen atom joining them are a pyridinium or triethylenediamine radical,

• A is an alkylene radical having 2 to 6 C atoms,
• X and Y independently of one another are hydrogen, halogen, C.sub.1 -C.sub.4 alkyl or C.sub.1 -C.sub.4 alkoxy which are unsubstituted or substituted by hydroxyl, halogen, cyano or C.sub.1 -C.sub.4 alkoxy and An.sup.- is an anion.