in a solution of x % by weight of benzyl alcohol (B) in water, and z % by weight of at least one formulation additive (F),in whichx is a number in the range from 0.5 to 4,y is a number in the range from 5 to 35andz is a number in the range from 0 to 2,and is essentially free from alcohols other than (B) and from solvents or solubilizers other than water and (B).As anionic dyes (A), any desired an