Patent ID: 7642023

Claim:
A color image forming method comprising: (a) charging plural photoreceptors; (b) conducting an exposure process to each of surfaces of the plural photoreceptors charged in step (a) to form plural electrostatic latent images; (c) developing the plural electrostatic latent images with different color toners corresponding to the plural electrostatic latent images to form different color toner images via step (b); and (d) transferring each of the different color toner images via superimposition of the different color toner images on a recording material or an intermediate image transfer material, wherein the different color toners comprise at least 6 kinds of chromatic color toners having different reflection spectra and a black toner, and each of the at least 6 kinds of chromatic color toners and the black toner comprises particles having a median particle diameter (D50) of 3-7 μm in terms of volume, and an external additive having a primary diameter of 40-800 nm; and wherein each of the at least 6 kinds of chromatic color toners and the black toner has a decline starting temperature of a storage elastic modulus of 10-40° C., and a temperature of 70-130° C. in the storage elastic modulus range of 10 3 -10 4 Pa.