Reversal electrophotographic developing method employing recyclable magnetic toner

A process of producing a magnetic toner wherein

• i) each particle of said magnetic toner comprises at least a binder resin, a magnetic powder material and additives including polypropylene, said binder resin, magnetic powder and additives being kneaded and dispersed by thermal melting,
• ii) the product of i) being pulverized into particles, and then
• iii) instantaneously contacting the pulverized particles of ii) with a stream of hot air having a temperature of between 100 and 600.degree. C. and pressure of 1.5 to 5.0 kg/cm.sup.2 so that the surface of the binder resin of the toner particles is melted, whereby magnetic material exposed on the surface of the particles is coated with the binder resin, followed by rapidly cooling said particles with a stream of cool air lower than 10.degree. C., and
• iv) said magnetic toner having a dielectric loss of at most 3.5.times.10.sup.-3, a volume mean particle diameter in a range of 6 to 12 .mu.m and a specific surface area in a range of 0.4 to 4.0 m.sup.2 /g.