Inks containing a water soluble compound as a stabilizer particularly for ink jet printing

Claim 1

An ink which contains a water soluble dye and at least one water-soluble compound of the formula ##STR8## in which R 1 is hydrogen, alkyl having 1 to 4 carbon atoms, allyl or --CO--CH 3 , R 3 and R 4 , independently of one another, are hydrogen or --CO 2 .sup.⊖ M.sup.⊕, and R 5 , R 6 and R 7 , independently of one another, are hydrogen, alkyl having 1 to 8 carbon atoms which is unsubstituted or substituted by --CO 2 R 8 , --CO 2 .sup.⊖ M.sup.⊕ or phenyl, or are --CO 2 R 8 where R 8 is a group of the formula --CH 2 CH 2 O) 1-20 R 11 in which R 11 is hydrogen, alkyl having 1 to 4 carbon atoms or a group of the formula ##STR9## in which R 1 is as defined above, Y is a direct bond or alkylene having 1 to 8 carbon atoms, and R 60 and R 70 , independently of one another, are hydrogen or alkyl having 1 to 8 carbon atoms, M.sup.⊕ is a monovalent, divalent or trivalent metal cation, H.sup.⊕ or a group of the formula .sup.⊕ N(R 17 )(R 12 )(R 13 )(R 14 ) in which R 17 , R 12 , R 13 and R 14 , independently of one another, are hydrogen, alkyl having 1 to 8 carbon atoms, alkyl having 2 to 8 carbon atoms which is substituted by 1 to 3 hydroxyl groups or is interrupted by oxygen, alkenyl having 3 to 5 carbon atoms or benzyl, at least one of the substituents R 3 to R 7 being --CO 2 .sup.⊖ M.sup.⊕ or --CO 2 R 8 .