Method of developing an electrostatic latent image

A method for forming a toner image on a photosensitive material bearing an electrostatic latent image comprising

• (a) introducing a one component developer consisting of fine toner particles, said particles containing a resin and ferromagnetic powder dispersed in said resin in such a fashion that a portion of said ferromagnetic powder is exposed on the surface of said toner particles, said toner particles having a specific resistivity of at least 10.sup.14 ohm cm and being capable of accepting a triboelectric charge,
• into a toner vessel which includes a regulating plate for controlling the amount of toner to be fed,
• (b) feeding said toner onto a toner feeder comprising a non-magnetic cylinder drum and a plurality of magnets disposed therein so that south and north poles are directed to the inner surface of non-magnetic cylinder,
• (c) carrying said toner, by rotary movement of either said non-magnetic cylinder or said plurality of magnets, along the surface of said non-magnetic cylinder into close proximity to said electrostatic latent image,
• said toner particles developing a triboelectric charge of a polarity opposite to that of said electrostatic latent image during steps (a) through (c) in the absence of a corona discharging device, and
• (d) bringing said toner particles into contact with said electrostatic latent image.