Toner kit and color-image-forming method

A color image-forming method comprising:

• a charging step of electrostatically charging an electrostatic-latent-image-bearing member for holding thereon an electrostatic latent image;
• an electrostatic latent image formation step of forming the electrostatic latent image on the electrostatic-latent-image-bearing member thus charged;
• a developing step of developing the electrostatic latent image by the use of a toner a developing means has, to form a toner image;
• a transfer step of transferring the toner image held on the electrostatic-latent-image-bearing member, to a transfer material via, or not via, an intermediate transfer member;
• and
• a fixing step of fixing by a fixing means the toner image held on the transfer material,
• wherein i) a non-magnetic black toner has at least carbon black and ii) at least three color toners each are used as the toner,
• wherein said black toner has a weight-average particle diameter represented by D4b and a one-point method BET specific surface area represented by Sb, and said color toners, other than the black toner, each having a weight-average particle diameter represented by D4c and a one-point method BET specific surface area represented by Sc,
• wherein said black toner and color toners satisfy the following relations (1) and (2):
• 0.60≦D4c/D4b≦0.96, Relation (1)
• 0.750≦Sc/Sb≦1.000, Relation (2)
• and each have an average circularity of from 0.950 to 1.000 and a circularity standard deviation of less than 0.040 as measured with a flow type particle image analyzer, and
• wherein, where the proportion of 5.04 μm or smaller particles that is calculated from number-based particle size distribution of said black toner is represented by Ub5.04 (% by number), the proportion of 5.04 μm or smaller particles that is calculated from number-based particle size distribution of each of said color toners is represented by Uc5.04 (% by number), the proportion of 12.7 μm or larger particles that is calculated from weight-based particle size distribution of said black toner is represented by Ub12.7 (% by weight), and the proportion of 12.7 μm or larger particles that is calculated from weight-based particle size distribution of each of said color toners is represented by Uc12.7 (% by weight), the toners satisfy the following relations (3), (4) and (5):
• 1.2≦Uc5.04/Ub5.04≦6.0, Relation (3)
• Ub12.7≦2.0, Relation (4)
• Uc12.7≦1.0. Relation (5).