Abstract: Shell fossil powder is added to a flocculation agent which is mainly composed of gypsum and silicate compound, and the mixture is added to a suspension. The mixing ratio of the flocculation agent and shell fossil powder is 3:1. The flocculation agent functions as a coagulation core A, and the shell fossil powder is able to absorb grains in the suspension as a carrier B and is acquired by the coagulation core A. The carrier B is a grain which is able to effectively utilize Ca.sup.2+ flocculation site of the coagulation core A, which absorbs a great deal of suspending grains, wherein the suspending grains are acquired by the coagulation core A and form a large flock and are quickly settled.

Abstract: A dye composition prepared by polymerizing an unsaturated monomer in the presence of a quinoneimine dye and an azo initiator in amounts expressed by x.gtoreq.5 and y.gtoreq.0.33x.sup.1.2 wherein x is the amount of the quinoneimine dye in % by weight based on the unsaturated monomer, and y is the amount of the azo initiator in % by weight based on the unsaturated monomer. The composition is useful for preparing toners for developing electrostatic images because of its outstanding charge control effect and also for preparing electrostatic coating powder compositions.

Abstract: A dye composition prepared by polymerizing an unsaturated monomer in the presence of a quinoneimine dye and an azo initiator in amounts expressed by x.gtoreq.5 and y.gtoreq.0.33x.sup.1.2 wherein x is the amount of the quinoneimine dye in % by weight based on the unsaturated monomer, and y is the amount of the azo initiator in % by weight based on the unsaturated monomer. The composition is useful for preparing toners for developing electrostatic images because of its outstanding charge control effect and also for preparing electrostatic coating powder compositions.