Storage-stable formulation of fluorescent whitening mixtures

A storage-stable liquid whitener formulation which comprises

• a) 15 to 45% by weight, based on the total weight of the whitener formulation, of a mixture of at least two anionic fluorescent whiteners, wherein one of the fluorescent whiteners is of the formula (1) ##STR7## in which X and Y are, independently of each other, a secondary or tertiary amine radical or a mono- or disubstituted alkoxy group and
• M is a hydrogen atom or a salt-forming cation, and the other fluorescent whitener is of the formula (4) ##STR8## in which A is a sulfonic acid radical, hydrogen, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy or halogen and B is hydrogen, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy or halogen, with the proviso that at least one substituent A is a sulfonic acid radical, and m, n, o and p, independently of each other are the number 1 or 2;
• b) 0.1 to 25% by weight, based on the total weight of the whitener formulation, of an electrolyte or an electrolyte mixture;
• c) 0.01 to 1% by weight, based on the total weight of the whitener formulation, of an anionic polysaccharide;
• d) 0.2 to 20% by weight, based on the total weight of the whitener formulation, of one or more condensation products of aromatic sulfonic acids with formaldehyde as dispersants;
• and water.