Abstract: A rotary multicolor developing apparatus having a plurality of developing chambers defined in a rotatable developing drum, which neighbors and faces a photoconductive drum, and developing units each being disposed in a respective one of the developing chambers to supply toner of a particular color; the developing units being sequentially transported in a rotational motion to a predetermined developing region so that the toner is transferred from each developing unit to an electrostatic latent image provided on the photoconductive drum, thereby developing the latent image. In each developing unit, there are provided a magnetic brush which is sequentially transported between a toner supply region, the developing region, and a toner recovery region, a toner supply roller for transporting toner which is charged in the toner supply region to the magnetic brush, and a toner recovery roller for collecting in the toner recovery region the toner which remains on the magnetic brush after development.

Abstract: A toner for developing latent electrostatic images is disclosed, which consists of toner particles, with each toner particle consisting of (i) a core particle comprising an electroconductive material and/or magnetic powder and a binder agent, having a specific volume resistivity ranging from 10.sup.2 ohm-cm to 10.sup.9 ohm-cm and (ii) a coating layer comprising a coloring agent such as carbon black, or magnetic powder and a binder agent, having a specific volume resistivity of 10.sup.9 ohm-cm or more.