Colored toner for developing electrostatic images

A method for producing a colored toner for developing electrostatic images which comprises

• providing primary particles of polymer having acidic or basic polar groups,
• surface treating organic colorant selected from the group consisting of organic pigment, organic dye and mixtures thereof, with a surface treatment agent having the same ionic character as the primary particles in a dispersion of the primary particles in an aqueous media, such that the absolute value of .zeta.-potential in the state of an aqueous dispersion at pH 5 becomes 10 to 100 mV,
• mixing the primary particles with the surface treated organic colorant to thereby form secondary particles comprising aggregates of the primary particles and the surface treated organic colorant,
• further aggregating the secondary particles in an aqueous medium to form a dispersion of associated particles, and
• drying said dispersion of associated particles to form said toner.