Patent ID: 7713670

Claim:
A developer for an electrophotographic tandem image forming method, comprising: a toner; and a carrier, wherein the toner has a shape factor SF-1 of from 120 to 160, an average circularity of from 0.93 to 0.98, a weight-average particle diameter (D4) of from 3.0 to 8.0 μm, and a ratio (D4/Dn) of the weight-average particle diameter (D4) to a number-average particle diameter (Dn) of from 1.01 to 1.20, and wherein the carrier comprises ferrite particles coated with a resin having alumina dispersed therein, wherein the carrier has an average particle diameter of from 20 to 45 μm and the following formula: (MgO)x(MnO)y(Fe 2 O 3 )z wherein x is from 1 to 5 mol %, y is from 5 to 55 mol % and z is from 45 to 55 mol %.