Abstract: A method of recording a multi-color image containing a plurality of image regions formed by applying an black ink and a color ink to overlap each other in different orders, where the black ink contains a salt, an aqueous medium and a pigment dispersed in the aqueous medium by the action of an ionic group, and the color ink contains a dye. Otherwise, the black ink contains a salt, an aqueous medium and a pigment dispersed in the aqueous medium by the action of an ionic group, and the color ink is reactive with the black ink. This method enables to obtain high quality images free from density unevenness or excellent in uniform feeling.

Abstract: The present invention provides a pigment ink having carbon black having a dispersant and an ink which can provide high-grade images having a superior rub resistance without the loss of the inherent advantages of the pigment ink and can keep bleeding from occurring when color images are formed. The ink is an ink comprising at least one salt selected from (M1)2SO4, CH3COO(M1), Ph—COO(M1), (M1)NO3, (M1)Cl, (M1)Br, (M1)I, (M1)2SO3 and (M1)2CO3 wherein M1 represents an alkali metal, ammonium or an organic ammonium, and Ph represents a phenyl group, and a carbon black having a dispersant.

Abstract: An ink is provided which suppresses the influence of the kinds of recording media on the image quality, is excellent in image quality, effectively inhibits the occurrence of bleed upon the formation of color images, is excellent in long-term shelf stability and stably forms high quality images. The ink contains at least one salt selected from the group consisting of (M1)2SO4, CH3COO(M1), Ph-COO(M1), (M1)NO3, (M1)Cl, (M1)Br, (M1)I, (M1)2SO3 and (M1)2CO3, wherein M1 represents an alkali metal, ammonium or organic ammonium, and Ph represents a phenyl group, and a self-dispersing anionic carbon black having a functional-group density of at least 1.8 (&mgr;mol/m2) on its surface.

Abstract: An ink is provided which is capable of giving higher density of the printed image and has improved color developability with the light fastness and image stability maintained, and suppressing occurrence of bleeding in color image formation. The ink contains a capsuled coloring material constituted of a water-insoluble coloring material and an organic polymer covering the coloring material, the capsuled coloring material containing the organic polymer at a content ranging from 1% by weight to 20% by weight.

Abstract: An ink set capable of reducing the influence of recording media on image quality and stably forming high-quality images is provided. The ink set includes a liquid composition containing at least one salt selected from the group consisting of (M1)2SO4, CH3COO(M1), Ph—COO(M1), (M1)NO3, (M1)Cl, (M1)Br, (M1)I, (M1)2SO3 and (M1)2CO3, wherein M1 denotes an alkali metal, ammonium or organic ammonium, and Ph denotes a phenyl group, and at least one ink selected from the group consisting of yellow, magenta, cyan, black, red, blue and green inks.

Abstract: An ink comprise a dye, a silicon-containing surfactant, an ethylene oxide adduct of acetylene glycol and a liquid medium, wherein a weight ratio of the silicon-containing surfactant to the ethylene oxide adduct of acetylene glycol is not lower than {fraction (1/5000)}, but lower than {fraction (1/20)}. An ink-jet recording process include the step of ejecting the ink by an ink-jet system. An ink set include in combination a first dye having a certain color tone, and a second dye ink having a color tone different from that of the first dye ink, wherein at least one of the first and second dye inks is the above ink. An ink set include dye inks of yellow, magenta and cyan, wherein the dye inks include an ethylene oxide adduct of acetylene glycol respectively, and the dye inks of magenta and cyan further have a silicon-containing surfactant.

Abstract: An ink set comprising a black ink and a color ink, suitable for an ink-jet recording apparatus comprising a common recovery system for a black ink-ejecting orifice and a color ink-ejecting orifice. The black ink comprises particles of self-dispersing carbon black having at least one anionic hydrophilic group at the surface thereof in an aqueous medium, and the pH of the color ink is higher than the pH of the black ink.

Abstract: An ink comprising particles of self-dispersing carbon black having at least one hydrophilic group at the surface thereof, and calcium in an aqueous medium. The ink can form images excellent in fastness properties such as water fastness and light fastness and character quality, and can be stably ejected from a recording head irrespective of printing environment.

Abstract: An ink comprise a dye, a silicon-containing surfactant, an ethylene oxide adduct of acetylene glycol and a liquid medium, wherein a weight ratio of the silicon-containing surfactant to the ethylene oxide adduct of acetylene glycol is not lower than {fraction (1/5000)}, but lower than {fraction (1/20)}.

Abstract: An ink comprises a coloring material and an aqueous medium wherein the coloring material contains a self-dispersing type carbon black, in which self-dispersing carbon black a hydrophilic group combines with the surface of a carbon black directly or through another atomic group, and which ink contains potassium ion in an amount of 0.6% or more of the weight of the carbon black.

Abstract: Disclosed herein is an ink set comprising two black inks the coloring materials for which are both pigments, wherein one black ink is cationic, and the other black ink is anionic.

Abstract: Provided is a black ink capable of mitigating the dependency on image quality of recording media and giving a high quality image stably, which comprises at least one salt selected from the group consisting of (M1)2SO4, CH3COO(M1), Ph_COO(M1), (M1)NO3, (M1)Cl, (M1)Br, (M1)I, (M1)2SO3 and (M1)2CO3, where M1 is an alkali metal, ammonium or organo-ammonium and Ph is a phenyl group, and a self dispersible carbon black.

Abstract: Provided is a black ink capable of mitigating the dependency on image quality of recording media and giving a high quality image stably, which comprises at least one salt selected from the group consisting of (M1)2SO4, CH3COO(M1), Ph_COO(M1), (M1)NO3, (M1)Cl, (M1)Br, (M1)I, (M1)2SO3 and (M1)2CO3, where M1 is an alkali metal, ammonium or organo-ammonium and Ph is a phenyl group, and a self dispersible carbon black.

Abstract: Provided is a black ink capable of mitigating the dependency on image quality of recording media and giving a high quality image stably, which comprises at least one salt selected from the group consisting of (M1)2SO4, CH3COO(M1), Ph_COO(M1), (M1)NO3, (M1)Cl, (M1)Br, (M1)I, (M1)2SO3 and (M1)2CO3, where M1 is an alkali metal, ammonium or organo-ammonium and Ph is a phenyl group, and a self dispersible carbon black.

Abstract: Disclosed herein is a pigment ink comprising self-dispersing type carbon black to the surface of which at least one hydrophilic group is bonded through another atomic group, an aqueous medium, and a silicon compound. The pigment ink can form images excellent in fastness properties such as water fastness and light fastness and character quality, can be efficiently ejected when applied to ink-jet recording and can also be stably ejected from a recording head irrespective of recording head and printing environment.

Abstract: Disclosed herein is a water-based pigment ink comprising a coloring material composed of self-dispersing carbon black obtained by bonding at least one hydrophilic group directly or through another atomic group to the surface of carbon black, a humectant of the general formulaH--(CH.sub.2).sub.m --C--((CH.sub.2).sub.n OH).sub.3wherein m and n are independently an integer of from 1 to 5, and an aqueous medium composed of water and a water-soluble organic solvent.