A one-component type magnetic developer.

摘要

A one-component type magnetic developer consists essentially of developer particles of a composition comprising a binder resin medium and a powdery magnetic material dispersed in the binder resin medium, wherein said powdery magnetic material comprises (A) a nonpulverizing agglomerate of cubic particles of magnetite having a particle size of 1 to 10 mu m as measured by an electron microscope and (B) magnetite particles having a particle size of 0.2 to 1 mu m at an (A)/(B) weight ratio of from 95/5 to 10/90.