Ricoh Company, Ltd.

Yuutaroh Nonaka

Tomohiro Nakagawa

Kazuhiko Umemura

Hiroki Hagiwara

Yuusuke Fujita

Sei Yamamoto

An ink contains water, Pigment Red 269, a compound represented by the following Chemical formula (1), and at least one of a silicone compound and an acetylene glycol compound, where the proportion of the compound represented by the following Chemical formula (1) to the Pigment Red 269 is 2.0 percent by mass or less: 

Ink, ink accommodating unit, printing device and printing method

An ink includes water, a compound represented by the following Chemical formula 1, Pigment Red 269 represented by the following Chemical formula 2, and alkylene glycol alkyl ether, wherein the proportion of the compound represented by the following Chemical formula 1 in a total amount of the Pigment Red 269 is 2 or less percent by mass. 

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Kanagawa, Japan

Yuutaroh Nonaka