| 摘要 |
An electrostatic developer comprising a mixture of an electrically conductive magnetic toner and an insulating nonmagnetic toner, which can give excellent, fogging-free images having sufficient image density in a wide range of the electrically conductive magnetic toner/insulating nonmagnetic toner mixing ratio when used with a low-potential developing system. The electrically conductive magnetic toner is a toner which is formed by attaching or fixing a frictionally chargeable substance which is chargeable to have a polarity reverse to the polarity of the insulating nonmagnetic toner, to a surface of a main electrically conductive magnetic toner component containing 30 to 70% by weight of a magnetic powder and which has a volume specific resistance of 1x103 OMEGA .cm or less, the insulating nonmagnetic toner being a toner which is chargeable to have the same polarity as the polarity of the main electrically conductive magnetic toner component when the electrostatic developer is transferred to a photoconductive drum and which has a volume specific resistance of 1x109 OMEGA .cm or more.
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