Abstract: An ink set according to an aspect of the present disclosure includes a first ink and a second ink, the ink set described above is used for an ink jet recording apparatus which includes a recording head having at least one first ejection port which ejects the first ink and at least one second ejection port which ejects the second ink; and a cap which collectively caps the first ejection port and the second ejection port, the first ink contains water and a self-dispersible pigment, and the second ink contains water, a water-soluble dye, and a pigment dispersant.

Abstract: An ink set includes a first ink containing the compound represented by formula (y-1) or its salt, a second ink containing one or two or more of the compound represented by formula (m-1) or its salt, the compound represented by formula (m-2) or its salt, a compound represented by formula (m-3) or its salt, and the compound represented by formula (m-4) or its salt, and a third ink containing one or two or more of a compound represented by formula (c-1) or its salt, the compound represented by formula (c-2) or its salt, the compound represented by formula (c-3) or its salt, a compound represented by formula (c-4) or its salt, and the compound represented by formula (c-5) or its salt.

Abstract: An ink set includes a pigment ink, containing a pigment, and a dye ink containing the compound represented by formula (y-1) below or a salt thereof.

Abstract: An ink jet recording apparatus includes an ink composition, an ink encasement in which the ink composition is encased, a recording head that ejects the ink composition, and a carriage configured to move the recording head back and forth. The carriage carries the ink encasement, with the ink encasement integrated with the carriage. The ink encasement has an ink fill port that opens and shuts as a port through which the ink composition is loaded. The ink composition contains a disperse colorant, with the volume-average particle diameter of the disperse colorant being 110.0 nm or more and 200.0 nm or less, and also contains at least one organic solvent with an SP of 9 or more, with the percentage thereof being 10.0% by mass or more.

Abstract: An ink jet recording apparatus includes an ink composition, an ink encasement in which the ink composition is encased, a recording head that ejects the ink composition, and a carriage configured to move the recording head back and forth. The carriage carries the ink encasement, with the ink encasement integrated with the carriage. The ink encasement has an ink fill port that opens and shuts as a port through which the ink composition is loaded. The ink composition contains a water-soluble dye and a polyhydric alcohol with a normal boiling point of 270° C. or above, with the percentage of the polyhydric alcohol being 26.0% by mass or less of the total amount of the ink composition.

Abstract: An ink jet recording apparatus includes an ink composition, an ink encasement in which the ink composition is encased, a recording head that ejects the ink composition, and a carriage configured to move the recording head back and forth. The carriage carries the ink encasement, with the ink encasement integrated with the carriage. The ink encasement has an ink fill port that opens and shuts as a port through which the ink composition is loaded. The ink composition contains a disperse colorant, with the volume-average particle diameter of the disperse colorant being 105.0 nm or less.

Abstract: An ink jet recording apparatus includes an ink composition, an ink encasement in which the ink composition is encased, a recording head that ejects the ink composition, and a carriage configured to move the recording head back and forth. The carriage carries the ink encasement, with the ink encasement integrated with the carriage. The ink encasement has an ink fill port that opens and shuts as a port through which the ink composition is loaded and also has a detector that detects the amount of ink composition encased. The ink composition contains a surfactant with an HLB of 6 or less.

Abstract: An ink jet ink composition of the present disclosure includes a coloring material, water, an acetylene glycol-based surfactant having a HLB value of 4 or less, and 1-(2-hydroxyethyl)-2-pyrrolidone. The content of 1-(2-hydroxyethyl)-2-pyrrolidone in the ink jet ink composition is 0.5% by mass or more and 5.0% by mass or less.

Abstract: An aqueous ink jet ink composition contains a color material, water, 1-(2-hydroxyethyl)-2-pyrrolidone, and a 1,2-alkanediol. The mass ratio of the content of the 1-(2-hydroxyethyl)-2-pyrrolidone and that of the 1,2-alkanediol is 1:10 to 10:1.

Abstract: An aqueous ink-jet ink composition according to the present disclosure contains pigment, water, resin particles, 1-(2-hydroxyethyl)-2-pyrrolidone, and trimethylglycine. The mass-based content of the resin particles is lower than the mass-based content of the pigment.

Abstract: An ink accommodating body accommodating an ink composition is provided, in which the ink composition contains water and a first dye that is a compound represented by Formula (B-1) or a salt thereof, a content of the first dye in the ink composition is 0.5% by mass or more with respect to a total amount of the ink composition, and a value of a ratio (A/V) is 1.7 or less where a total surface area of a metal, of the ink accommodating body, in contact with the ink composition is A (cm2) and an accommodation capacity for the ink composition accommodated in the ink accommodating body is V (cm3).

Abstract: An ink jet ink set includes: an aqueous dye ink and an aqueous pigment ink, the ink jet ink set is an ink set to be used for an ink jet recording apparatus which has a first ejection port to eject the aqueous dye ink, a second ejection port to eject the aqueous pigment ink, and a cap to collectively cap the first ejection port and the second ejection port, the cap being composed of the same member as that forming the first ejection port and the second ejection port, the aqueous dye ink contains a dye and a poly(oxyalkylene) alkyl ether, the dye includes a copper phthalocyanine compound having two or less benzene ring structures other than a phthalocyanine skeleton, and the aqueous pigment ink contains a self-dispersible pigment.

Abstract: An ink jet recording apparatus includes an ink composition, an ink encasement in which the ink composition is encased, a recording head that ejects the ink composition, and a carriage configured to move the recording head back and forth. The carriage carries the ink encasement, with the ink encasement integrated with the carriage. The ink encasement has an ink fill port that opens and shuts as a port through which the ink composition is loaded. The ink composition contains a disperse colorant, with the volume-average particle diameter of the disperse colorant being 110.0 nm or more and 200.0 nm or less, and also contains at least one organic solvent with an SP of 9 or more, with the percentage thereof being 10.0% by mass or more.

Abstract: An ink jet recording apparatus includes at least one aqueous ink composition, at least one ink encasement in which the aqueous ink composition is encased, a recording head that ejects the aqueous ink composition, and a carriage configured to move the ink encasement and the recording head back and forth. The carriage carries the ink encasement, with the ink encasement integrated with the carriage. The ink encasement has an ink fill port that opens and shuts as a port through which the aqueous ink composition is loaded, and the maximum external length of the ink encasement in the direction parallel with the direction in which the carriage moves back and forth is 30.0 mm or less.

Abstract: An ink jet recording apparatus includes an ink composition, an ink encasement in which the ink composition is encased, a recording head that ejects the ink composition, and a carriage configured to move the recording head back and forth. The carriage carries the ink encasement, with the ink encasement integrated with the carriage. The ink encasement has an ink fill port that opens and shuts as a port through which the ink composition is loaded. The ink composition contains a disperse colorant, with the volume-average particle diameter of the disperse colorant being 105.0 nm or less.

Abstract: An ink jet recording apparatus includes an ink composition, an ink encasement in which the ink composition is encased, a recording head that ejects the ink composition, and a carriage configured to move the recording head back and forth. The carriage carries the ink encasement, with the ink encasement integrated with the carriage. The ink encasement has an ink fill port that opens and shuts as a port through which the ink composition is loaded and also has a detector that detects the amount of ink composition encased. The ink composition contains a surfactant with an HLB of 6 or less.

Abstract: An ink jet recording apparatus includes an ink composition, an ink encasement in which the ink composition is encased, a recording head that ejects the ink composition, and a carriage configured to move the recording head back and forth. The carriage carries the ink encasement, with the ink encasement integrated with the carriage. The ink encasement has an ink fill port that opens and shuts as a port through which the ink composition is loaded. The ink composition contains a water-soluble dye and a polyhydric alcohol with a normal boiling point of 270° C. or above, with the percentage of the polyhydric alcohol being 26.0% by mass or less of the total amount of the ink composition.

Abstract: An ink set according to an aspect of the present disclosure includes a first ink and a second ink, the ink set described above is used for an ink jet recording apparatus which includes a recording head having at least one first ejection port which ejects the first ink and at least one second ejection port which ejects the second ink; and a cap which collectively caps the first ejection port and the second ejection port, the first ink contains water and a self-dispersible pigment, and the second ink contains water, a water-soluble dye, and a pigment dispersant.

Abstract: An ink set includes a first ink containing the compound represented by formula (y-1) or its salt, a second ink containing one or two or more of the compound represented by formula (m-1) or its salt, the compound represented by formula (m-2) or its salt, a compound represented by formula (m-3) or its salt, and the compound represented by formula (m-4) or its salt, and a third ink containing one or two or more of a compound represented by formula (c-1) or its salt, the compound represented by formula (c-2) or its salt, the compound represented by formula (c-3) or its salt, a compound represented by formula (c-4) or its salt, and the compound represented by formula (c-5) or its salt.

Abstract: An ink set includes a pigment ink, containing a pigment, and a dye ink containing the compound represented by formula (y-1) below or a salt thereof.