Fujifilm Corporation

Kosuke Watanabe

Naoharu Kiyoto

Toshiyuki Makuta

Kensuke Masui

Kazuhiro Hamada

Yushi Hongo

Provided is an ink composition used for image formation by an ink jet method. The ink composition includes plate-like metal particles that include a metal element having a standard oxidation-reduction potential nobler than &#x2212;1.65 V, that have an average equivalent circle diameter of 10 nm or more and less than 500 nm, and that have an average aspect ratio, which is the ratio of the average equivalent circle diameter to an average thickness, of 3 or more. Also provided are an ink set, an image forming method, and a printed matter.

Ink composition, ink set, image forming method, and printed matter

Provided is an ink composition used for image formation by an ink jet method. The ink composition includes plate-like metal particles and an organic solvent having a boiling point of 150&#xb0; C. or higher and a solubility parameter of 24 MPaor more. The maximum absorption wavelength of the ink composition in the wavelength range of 300 nm to 2,500 nm is located in the wavelength range of 800 nm to 2,500 nm. Also provided is an image forming method.

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Kanagawa, Japan

Kosuke Watanabe