Abstract: An image forming apparatus includes first and second image forming units. The first image forming unit forms a first image on a surface of a recording medium which has ratios of reflecting incident light. The second image forming unit forms a second image on the surface. The ratios of the recording medium are equal to or greater than a threshold value in all of a specular direction and a specific direction other than the specular direction. The first image has a ratio of reflecting the incident light in the specular direction being equal to or greater than the threshold value and a ratio of reflecting the incident light in the specific direction being less than the threshold value. The second image has the ratios of reflecting the incident light in the specular direction and in the specific direction being less than the threshold value.

Abstract: An image processing device provided with an acquiring unit and a generating unit. The acquiring unit acquires invisible image data of an invisible image subject to forming on a recording medium with invisible coloring material and acquires source image data of a source image subject to forming on the recording medium with visible coloring material. The generating unit generates corrected-image-data of the source image data corrected according to the absorption wavelength characteristics of the invisible coloring material, such that the color of overlapping regions where both the invisible image and the source image are superimposed when formed on the recording medium approximates to the color of regions corresponding to the overlapping regions in the source image.

Abstract: An image-forming material includes a perimidine-based squarylium dye represented by the following Formula (I): wherein, in Formula (I), R represents a hydrogen atom or a methyl group.

Abstract: A colorant comprising an aggregate of a molecule having a squarylium skeleton and having a maximum absorption wavelength at about 500 nm to about 600 nm in a molecular dispersion state.

Abstract: A perimidine-substituted squarylium dye is represented by the following formula (I):

Abstract: A recording medium includes a first image that is read with infrared light and that is formed of plural dots having infrared absorptivity, part of the plural dots being invisible first dots, the remaining dots being visible second dots; and a visible second image that is formed of the second dots or the second dots and visible third dots not having infrared absorptivity.

Abstract: The black color material includes a condensation product of a pyrrole compound represented by the following formula (1) and a squaric acid represented by the following formula (2):

Abstract: The image-forming material includes a perimidine-based squarylium dye represented by the following formula (I):

Abstract: The present invention provides a recording medium containing a first image formed with a first recording material; and a second image comprising a first region formed with a second recording material having approximately the same light fastness as that of the first recording material, and a second region formed with a third recording material having higher light fastness than that of the first recording material, a color of the second region being a color corresponding to any stage of a process of discoloration of the first region.

Abstract: A perimidine-substituted squarylium dye is represented by the following formula (I):

Abstract: An image forming material includes a perimidine-substituted squarylium dye that has a structure represented by the following formula (I) and shows diffraction peaks at least at Bragg angles (2?±0.2°) of 17.7°, 19.9°, 22.1°, 23.2° and 24.9° in its X-ray powder diffraction spectrum measured by irradiation with X rays generated from a Cu target with a wavelength of 1.

Abstract: An image-forming material includes a perimidine-based squarylium dye represented by the following Formula (I): wherein, in Formula (I), R represents a hydrogen atom or a methyl group.

Abstract: A display medium includes: a first substrate having transparency and provided with a transparent electrode on one face thereof, a member having a plurality of penetration holes, the member being placed on a surface of the transparent electrode, the penetration holes penetrating the member from the transparent electrode surface side, the ratio of the length of each of the penetration holes to the largest hole diameter being two or more; a second substrate placed so as to face the transparent electrode side of the first substrate; an electrolytic solution containing a metal ion and placed so as to fill a space between the first and second substrates; and a counter electrode placed in a position so as to be insulated from the transparent electrode and in contact with the electrolytic solution.

Abstract: A colorant contains a crystal of a compound represented by the following formula (1): the crystal having a crystal form showing main peaks at interplanar spacings d of 3.45±0.5 ?, 3.63±0.5 ?, 4.23±0.5 ?, 6.65±0.5 ?, and 7.84±0.5 ? in powder X-ray diffraction pattern with CuK? radiation.

Abstract: A colorant contains a crystal of a compound represented by the following formula (1): the crystal having a crystal form showing main peaks at interplanar spacings d of 3.45±0.5 ?, 3.63±0.5 ?, 4.23±0.5 ?, 6.65±0.5 ?, and 7.84±0.5 ? in powder X-ray diffraction pattern with CuK? radiation.

Abstract: The black color material includes a condensation product of a pyrrole compound represented by the following formula (1) and a squaric acid represented by the following formula (2):

Abstract: An image processing device provided with an acquiring unit and a generating unit. The acquiring unit acquires invisible image data of an invisible image subject to forming on a recording medium with invisible coloring material and acquires source image data of a source image subject to forming on the recording medium with visible coloring material. The generating unit generates corrected-image-data of the source image data corrected according to the absorption wavelength characteristics of the invisible coloring material, such that the color of overlapping regions where both the invisible image and the source image are superimposed when formed on the recording medium approximates to the color of regions corresponding to the overlapping regions in the source image.

Abstract: The image-forming material includes a perimidine-based squarylium dye represented by the following formula (I):

Abstract: A black color material includes a squarylium compound represented by the following formula (1); and a blue color material:

Abstract: The present invention provides a toner including a binder resin and metal particles containing Au, Ag, Cu, Pt, or an alloy thereof having a volume average particle diameter of from about 1 nm to about 300 nm, or an average maximum length of from about 10 nm to about 200 nm. The invention also provides a novel toner including metal particles which absorb light at plasmon frequencies.