Patent ID: 6936394

Claim:
A replenishing developer, comprising: 1 wt. part of a carrier and 2-50 wt. parts of a toner, wherein the carrier is a magnetic fine particle-dispersed resin carrier comprising at least inorganic compound particles and a carrier binder resin, the toner has a weight-average particle size of 3 to 10 μm and contains 1 to 40 wt. % of solid wax, wherein the carrier binder resin comprises a thermosetting resin, wherein the inorganic compound particles comprise magnetite particles containing at least one additive element selected from the group consisting of magnesium, silicon, manganese and phosphorous, and wherein the magnetite particles contain said at least one additive element in a total amount of 0.03-5.0 wt. % based on Fe.