| 摘要 |
This invention provides a developing agent, which, regardless of environment, can stably form high-resolution and high-definition images for a long period of time, and a method for image formation. The developing agent comprises at least toner particles containing at least a binder resin and a composite inorganic fine powder and is characterized in that the composite inorganic fine powder has peaks at Bragg angles (2R ± 0.20 deg) of 32.20 deg, 25.80 deg and 27.50 deg in a CuKE characteristic X-ray diffraction pattern, and the half value width of the X-ray diffraction peak at the Bragg angle (2R ± 0.20 deg) of 32.20 deg is 0.20 to 0.30 deg.
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