Aqueous slurry for a coating colour composition for paper, board or the like

An aqueous slurry for manufacture of a coating colour composition for paper or board, the slurry comprising inorganic mineral particles and a dispersion agent, which is an anionic lignin-carbohydrate complex, where lignin and one or more carbohydrates are covalently bound with each other, wherein the one or more carbohydrates in the anionic lignin-carbohydrate complex are formed from monosaccharides and the lignin-carbohydrate complex has a weight average molecular weight MW >8000 g/mol, wherein the lignin-carbohydrate complex has a lignin:carbohydrate ratio from 90:10 to 10:90, and wherein the difference between a first viscosity value, measured for the slurry immediately after its preparation, and a second viscosity value, measured for the slurry after 2 hours, is less than 10%.