A process for the production of insulator-coated black particles, which comprises the steps of (1-a) dispersing particles of silica or a
metal oxide in an
alcohol-based
solvent consisting mainly of an intermediate
alcohol to obtain a dispersion of the above particles, (1-c) forming a
titanium oxide coating of TiO2 on the surface of each of the particles whose surfaces have been activated in the above step, to obtain
titanium oxide-coated particles, (1-d) calcining the
titanium oxide-coated particles obtained in the above step in a reducing and / or
nitriding atmosphere and thereby blackening the above
titanium oxide coatings to obtain black particles, and (1-e) forming an electrical insulator
coating on a surface of each of the black particles obtained in the above step, to obtain insulator-coated black particles; characterized in that the process includes a step of (1-b) adding an alkaline
aqueous solution to the dispersion obtained in step (1-a) to activate a surface of each of the particles of a
metal oxide.