Provided is an ink jet recording apparatus including: a base metal pigment ink composition; and a first nozzle that ejects the base metal pigment ink composition, in which the base metal pigment ink composition contains a flat base metal pigment of which a 50% average particle diameter D50 is in a range of 100 nm to 1 m, and an organic compound of which a surface tension at 20 C. is 35 mN/m or greater, and an ejection interval T1 after the base metal pigment ink composition is ejected from the first nozzle and before the base metal pigment ink composition is ejected again from the first nozzle is within 100 s.

Ink contains at least one of a compound represented by the following chemical formula 1, a compound represented by chemical formula 2, a compound represented by chemical formula 3, or a compound represented by chemical formula 4. ##STR00001##

Disclosed herein is an ink composition, including: a pigment; acetylenediol having an HLB of less than 4; and an anionic surfactant, in which the mass ratio of the acetylene diol to the anionic surfactant is 0.30 to 4.0.

Disclosed herein is an ink composition, including: a pigment; acetylenediol having an HLB of less than 4; and an anionic surfactant, in which the mass ratio of the acetylene diol to the anionic surfactant is 0.30 to 4.0.

An ink jet method includes applying a first ink, a second ink, a first reaction liquid and a second reaction liquid to a recording medium to overlap each other in at least an area of the recording medium to form an image. The method includes a first reaction liquid applying step of applying the first reaction liquid to the recording medium, a first ink applying step of applying the first ink to the recording medium after the first reaction liquid applying step, a second ink applying step of applying the second ink to the recording medium after the first reaction liquid applying step and a second reaction liquid applying step of applying the second reaction liquid to the recording medium after the first reaction liquid applying step. The second reaction liquid has a higher surface tension than the first reaction liquid.

An ink jet method includes applying a first ink, a second ink, a first reaction liquid and a second reaction liquid to a recording medium to overlap each other in at least an area of the recording medium to form an image. The method includes a first reaction liquid applying step of applying the first reaction liquid to the recording medium, a first ink applying step of applying the first ink to the recording medium after the first reaction liquid applying step, a second ink applying step of applying the second ink to the recording medium after the first reaction liquid applying step and a second reaction liquid applying step of applying the second reaction liquid to the recording medium after the first reaction liquid applying step. The second reaction liquid has a higher surface tension than the first reaction liquid.

The present disclosure provides non-Newtonian inkjet inks and related methods. In one example, a non-Newtonian inkjet ink can comprise a gelator in an amount ranging from 0.1% to 10% by weight based on the total weight of the non-Newtonian inkjet ink; a salt in an amount of 0.05% to 20% by weight based on the total weight of the non-Newtonian inkjet ink; a sugar alcohol in an amount of 1% to 25% by weight based on the total weight of the non-Newtonian inkjet ink; and an organic solvent. The gelator and the salt can form a structured network, where the inkjet ink has a first dynamic viscosity ranging from 25 cps to 10,000 cps at a first state and a second dynamic viscosity ranging from 1 cps to 50 cps at a second state.

The present disclosure provides non-Newtonian inkjet inks and related methods. In one example, a non-Newtonian inkjet ink can comprise a gelator in an amount ranging from 0.1% to 10% by weight based on the total weight of the non-Newtonian inkjet ink; a salt in an amount of 0.05% to 20% by weight based on the total weight of the non-Newtonian inkjet ink; a sugar alcohol in an amount of 1% to 25% by weight based on the total weight of the non-Newtonian inkjet ink; and an organic solvent. The gelator and the salt can form a structured network, where the inkjet ink has a first dynamic viscosity ranging from 25 cps to 10,000 cps at a first state and a second dynamic viscosity ranging from 1 cps to 50 cps at a second state.

The present disclosure provides non-Newtonian inkjet inks and related methods. In one example, a non-Newtonian inkjet ink can comprise a low molecular weight organic gelator in an amount ranging from 0.1% to 10% by weight based on the total weight of the non-Newtonian inkjet ink; a salt in an amount of 0.05% to 20% by weight based on the total weight of the non-Newtonian inkjet ink; and an organic solvent. Additionally, the low molecular weight organic gelator and the salt can form a structured network and the inkjet ink can have a viscosity ranging from 100 cps to 10,000 cps at a temperature of 25 C. and a viscosity ranging from 1 cps to 10 cps at a temperature of 50 C.

The present disclosure provides non-Newtonian inkjet inks and related methods. In one example, a non-Newtonian inkjet ink can comprise a low molecular weight organic gelator in an amount ranging from 0.1% to 10% by weight based on the total weight of the non-Newtonian inkjet ink; a salt in an amount of 0.05% to 20% by weight based on the total weight of the non-Newtonian inkjet ink; and an organic solvent. Additionally, the low molecular weight organic gelator and the salt can form a structured network and the inkjet ink can have a viscosity ranging from 100 cps to 10,000 cps at a temperature of 25 C. and a viscosity ranging from 1 cps to 10 cps at a temperature of 50 C.