Electrographic developing method

An electrographic developing method for developing electrostatic latent images which comprises the steps of:

• (1) mixing insulating non-magnetic toner particles and carrier granules consisting essentially of an electrical insulating resin and at least 50%, by weight of the carrier granules, of magnetizable fine particles where the carrier granules have the properties of (1) triboelectrically charging the toner particles to a polarity suitable for developing the latent image by frictional contact with the toner particles, (2) being magnetic, (3) having an electro-resistivity of at least 10.sup.12 ohm-cm, and (4) being all substantially within the size range of 5 to 40 .mu.m;
• said toner particles being present in an amount of 2-50% by weight of the toner-carrier mixture;
• (2) magnetically attracting said mixture onto a developing sleeve which opposes a recording medium with narrow clearance at the developing station of 1.0 mm and under;
• and
• (3) flowing said mixture around the developing sleeve and to the developing station for applying said mixture on an electrostatic latent image formed on the recording medium and for developing said electrostatic latent image into a visible image.