An oil-based inkjet ink can be provided which prevents dye conversion of a dye lake pigment contained in the ink, prevents adhesion of the ink to the nozzle plate, and yields excellent drying properties for printed items. The oil-based inkjet ink contains a dye lake pigment, a pigment dispersant and a non-aqueous solvent, wherein the non-aqueous solvent contains a silicone oil having a surface tension of at least 20 mN/m but not more than 28 mN/m. The surface tension of the silicone oil is preferably at least 22 mN/m but not more than 26 mN/m.

An example of an ink supply includes an ink chamber containing a liquid ink, a salt chamber containing a salt solution, a separator positioned between the liquid ink and the salt solution, and a release mechanism. The separator completely separates the liquid ink from the salt solution prior to the release mechanism being triggered. The release mechanism has a triggered position and a retracted position. The triggered position causes the separator to at least partially open, and enables the liquid ink and the salt solution to be combined to form a mixture.

An example of an ink supply includes an ink chamber containing a liquid ink, a salt chamber containing a salt solution, a separator positioned between the liquid ink and the salt solution, and a release mechanism. The separator completely separates the liquid ink from the salt solution prior to the release mechanism being triggered. The release mechanism has a triggered position and a retracted position. The triggered position causes the separator to at least partially open, and enables the liquid ink and the salt solution to be combined to form a mixture.

A water-based ink for ink-jet recording includes: water; a solid solution pigment composed of at least a first pigment and a second pigment; and a non-solid solution pigment which is the same as the first pigment. An image L*.sub.60 of the first pigment has the highest chromaticness C* among those of pigments composing the solid solution pigment, the image L*.sub.60 having lightness L* which is closest to 60 among a plurality of solid images recorded on a recording paper by using one of aqueous dispersions containing the pigments composing the solid solution pigment at a same solid content concentration, respectively, while changing recording duty at every 5% in a range of 0% to 100%.

A water-based ink for ink-jet recording includes: water; a solid solution pigment composed of at least a first pigment and a second pigment; and a non-solid solution pigment which is the same as the first pigment. An image L*.sub.60 of the first pigment has the highest chromaticness C* among those of pigments composing the solid solution pigment, the image L*.sub.60 having lightness L* which is closest to 60 among a plurality of solid images recorded on a recording paper by using one of aqueous dispersions containing the pigments composing the solid solution pigment at a same solid content concentration, respectively, while changing recording duty at every 5% in a range of 0% to 100%.

A water-based ink for ink-jet recording includes: a solid solution of a quinacridone pigment including C.I. Pigment Red 202 and C.I. Pigment Violet 19; an azo pigment including C.I. Pigment Red 48:3; and water.

A water-based ink for ink-jet recording includes: a solid solution of a quinacridone pigment including C.I. Pigment Red 202 and C.I. Pigment Violet 19; an azo pigment including C.I. Pigment Red 48:3; and water.

A solvent-based ink composition contains: a luster pigment; a first solvent having a boiling point of 200 C. or lower and a surface tension .sub.1 of 28.0 mN/m or less; a second solvent having a boiling point of higher than 200 C. and a surface tension .sub.2 of more than 28.0 mN/m; and one or more third solvents having a boiling point of higher than 200 C. and a surface tension .sub.3 of 28.0 mN/m or less; where a content of the third solvents is 5.0% by mass or more and 92.0% by mass or less based on a total content of the second solvent and the third solvents.

A solvent-based ink composition contains: a luster pigment; a first solvent having a boiling point of 200 C. or lower and a surface tension .sub.1 of 28.0 mN/m or less; a second solvent having a boiling point of higher than 200 C. and a surface tension .sub.2 of more than 28.0 mN/m; and one or more third solvents having a boiling point of higher than 200 C. and a surface tension .sub.3 of 28.0 mN/m or less; where a content of the third solvents is 5.0% by mass or more and 92.0% by mass or less based on a total content of the second solvent and the third solvents.

An electrically conductive screen-printable PTC ink composition with low inrush current and high NTC onset temperature, consisting of at least two different polymers, polymer-1 and polymer-2; wherein the melting temperature difference between polymer-1 and polymer-2 must be greater than 50 C., and the mechanical strength of polymer-1 as expressed by Young's modulus must be greater than 200 MPa.