Patent ID: 8511814

Claim:
An ink composition comprising a metal pigment, wherein the metal pigment contains plate-like particles, and in the case where the longitudinal diameter on the planar surface of the plate-like particle is X, the lateral diameter is Y, and the thickness is Z, the 50% average particle diameter R50 of a corresponding circle determined from the surface area in the X-Y plane of the plate-like particle is between 0.5 and 3μm, and the condition R50/Z>5 is satisfied; and when applied to an inkjet recording device that satisfies the condition of L≧5W where L μm is the nozzle diameter of an inkjet head and W μm is the size of a mesh filter opening provided in an ink flow path, the number of plate-like particles where the average particle diameter R μm of a corresponding circle determined from the surface area in the X-Y plane of the plate-like particles satisfies the condition R>(L/5) being no more than 5% of the total number of plate-like particles.