| 摘要 |
A two-component developer includes a positively chargeable toner and a carrier. The positively chargeable toner is composed of an external additive and toner base particles containing at least a binder resin, a colorant, a charge control agent, and a release agent. The external additive contains at least silica. The silica has an average primary particle diameter (X) of 12 nm or more and 30 nm or less, an average agglomeration ratio (Y2/Y1) between an average agglomeration number (Y1) on a surface of the toner base particles and an average agglomeration number (Y2) on a surface of the carrier is 0.97 or more, and the average agglomeration number (Y2) on a surface of the carrier is 5 or more and 15 or less, is used. |
