Patent ID: 7906262

Claim:
A two-component developer, comprising: a cyan toner having cyan toner particles each having at least a binder resin and a colorant, and an external additive; and a magnetic carrier, (a) wherein the cyan toner has the following characteristics: (i) when a concentration of the cyan toner in a solution of the cyan toner in chloroform is represented by Cc (mg/ml) and an absorbance of the solution at a wavelength of 712 nm is represented by A712, a relationship between Cc and A712 satisfies the following expression (1) 2.00 <A 712/ Cc< 8.15 (1); (ii) a lightness L* and a chroma C* of the cyan toner determined in a powder state satisfy relationships of 25.0≦L*≦40.0 and 50.0≦C*≦60.0; and (iii) an absolute value for a triboelectric charge quantity of the cyan toner measured by a two-component method using the cyan toner and the magnetic carrier is 50 mC/kg or more and 120 mC/kg or less, and (b) wherein the magnetic carrier comprises at least magnetic core particles and a resin component; a packed bulk density ρ1 (g/cm 3 ) and a true density ρ2 (g/cm 3 ) of the magnetic core particles of the magnetic carrier satisfy relationships of 0.80≦ρ1≦2.40 and 0.20≦ρ1/ρ2≦0.42; a specific resistance of each of the magnetic core particles of the magnetic carrier is 1.0×10 3 Ω·cm or more and 5.0×10 7 Ω·cm or less; and when a 50% particle diameter on a volume basis of the magnetic carrier is represented by D50, an average breaking strength P1 (MPa) of the magnetic carrier having a particle diameter of D50−5 μm or more and D50+5 μm or less and an average breaking strength P2 (MPa) of the magnetic carrier having a particle diameter of 10 μm or more and less than 20 μm satisfy a relationship of 0.50≦P2/P1≦1.10.