IMAGE FORMING METHOD AND ELECTROSTATIC DEVELOPING CARRIER

PROBLEM TO BE SOLVED: To provide such an image forming method that the toner density is accurately detected and controlled by using a mechanism to detect and control the toner density by measuring the magnetic permeability of a developer, further that development of a carrier on a photoreceptor can be prevented and that high image quality can be obtd., and to provide an electrostatic developing carrier. SOLUTION: In this image forming method, a two-component developer comprising a magnetic carrier and a toner is used to develop an electrostatic latent image on a photoreceptor. The developing device is equipped with a mechanism to detect and control the toner density by measuring the magnetic permeability of the developer. As for the magnetic carrier, a material satisfying both of S/M>=30 and 1800