Canon Kabushiki Kaisha

Yuko Yakushigawa

Hisashi Teraoka

Yoshihisa Takizawa

Kumiko Mafune

Tsuyoshi Kanke

Mikio Sanada

Yoshifumi Hattori

Shinya Mishina

Yoichi Takada

Koichi Osumi

Takao Yamamoto

An ink set includes inks each containing a colorant and an aqueous medium, wherein in a fading test under conditions that cause fading corresponding to pseudo-indoor sunlight fading through a window for 3 years or more, the difference between respective images' &#x394;E, the images being produced with the respective inks, is 10 or less in a CIELAB color space display system, and each of the images has a residual ratio of reflection density of 70% or more. By using the ink set including the color inks with which images having substantially the same fading &#x394;E after long-term storage are produced, the color balance of a recorded image can be maintained after long-term storage.

Ink set, ink jet recording method, recording unit, ink cartridge and ink jet recording apparatus

Magenta ink exhibiting excellent coloration on various recording materials is provided according to the present invention. The magenta ink can realize high image densities and can produce images having superior light resistance. The magenta ink contains first and second coloring materials represented by the following general formulae 1 and 2, respectively, and a water-based medium

Ink, recording method, recording unit, ink cartridge, ink set, and recording apparatus

An ink set includes inks each containing a colorant and an aqueous medium, wherein in a fading test under conditions that cause fading corresponding to pseudo-indoor sunlight fading through a window for 3 years or more, the difference between respective images' &Dgr;E, the images being produced with the respective inks, is 10 or less in a CIELAB color space display system, and each of the images has a residual ratio of reflection density of 70% or more. By using the ink set including the color inks with which images having substantially the same fading &Dgr;E after long-term storage are produced, the color balance of a recorded image can be maintained after long-term storage.

A set of color ink-jet recording inks for recording a color image on a recording medium by using at least a black ink and a color ink, wherein the black ink has a cationic self-dispersible carbon black and the color ink has an anionic dye and an anionic substance. This ink set can achieve a high printing density and good printing grade without bleeding between black image and color image. It has a high reliability as an ink-jet ink.

Color ink-jet recording ink set, ink-jet recording method, recording unit, ink-cartridge, ink-jet recording apparatus and bleeding reduction method

An ink set for recording a color image with inks of two or more colors including at least one black ink and one color ink on a recording medium is provided. The ink set includes a black ink containing a self-dispersible carbon black having at least one cationic group bonded directly or through another atomic group to the surface thereof, and a color ink containing an anionic substance and having a buffering capability against a pH change. The ink set satisfies the requirements for print quality, image durability, and so forth and does not cause bleeding between a black ink-printed area and a color ink-printed area.

Ink set for color ink-jet recording, and recording method, recording apparatus, ink cartridge, recording unit and reduction of bleeding, employing the ink set

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),SO,, CH,COO(M1), Ph_COO(M1), (M1)NO,, (M1)Cl, (M1)Br, (M1)I, (M1),SO,and (M1),CO,, where M1 is an alkali metal, ammonium or organo-ammonium and Ph is a phenyl group, and a self dispersible carbon black.

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Kanagawa, Japan

Yuko Yakushigawa