Reactive dyes for inkjet printing

An aqueous ink formulation consisting essentially of

• a) one or more reactive dyes of the formula (I)
• F--(G--E--A--NMCN).sub.n (I)
• where
• F is the radical of a monoazo, disazo or polyazo dye, of a heavy metal complex of said azo dyes, or of an anthraquinone, phthalocyanine, formazan, azomethine, dioxazine, phenazine, stilbene, triphenyimethane, xanthene, thioxanthene, nitroaryl, naphthoquinone, pyrenequinone or perylenetetracarbimide dye,
• G is a chemical bond, --NR.sup.1 -- where R.sup.1 is hydrogen or C.sub.1 -C.sub.4 -alkyl, or a C.sub.1 -C.sub.8 -alkylene radical which is optionally interrupted by one or two groups of the formulae --O--, --NH-- and --NH--C.sub.6 H.sub.4 -- or a combination thereof,
• A is a chemical bond or a bivalent radical of the formula --CH.sub.2 --CH.sub.2, --CH(CH.sub.3)CH.sub.2 --, --CH.sub.2 CH(CH.sub.3)--, --CH.sub.2 --CHX--, CHX--CH.sub.2 --, --CH(CH.sub.3)--CHX-- or --CHX--CH(CH.sub.3)--, where X is in each case Cl or Br, and
• E is a chemical bond or the bivalent radical --SO.sub.2 -- or --CO--,
• or where G, E and A together are one or more heterocyclic reactive groups Z of the class of the pyrimidines, triazines, quinoxalines, phthalazines, quinazolines, pyridazines, benzimidazoles, benzoxazoles or benzothiazoles which each contain 1 or 2 NMCN radicals,
• M is a hydrogen atom, an alkali or alkaline earth metal or an ammonium group, and
• n is from 1 to 4,
• b) an alkaline agent, and
• c) optionally further customary additives.