To provide a dye which has a good hue, which can form an image showing a high fastness under various using conditions and environmental conditions, and which is particularly suited for an ink, the dye is represents by formula (1): wherein R1 and R2 each independently represents a monovalent group, Z represents a nitrogen atom or a carbon atom to which a hydrogen atom or a monovalent group is bonded, and M represents a hydrogen atom or a cation, provided that the dye has two azo groups.
提供一种具有良好色调、可以在各种使用条件和环境条件下形成高牢度图像,并特别适用于墨
水的
染料,该
染料由式(1)表示:其中R1和R2各自独立表示单价基团,Z表示氮原子或碳原子,该原子与氢原子或单价基团结合,M表示氢原子或阳离子,前提是该
染料具有两个偶氮基团。