| abstract |
A novel ink having sufficient fastness is provided. An ink containing a phthalocyanine compound represented by formula (I). [Chemical 1] In the formula, X 1 to X 4 and Y 1 to Y 4 each represent a carbon atom or a nitrogen atom. A 1 to A 4 each represents an atomic group necessary for forming an aromatic ring or a heterocycle together with X 1 to X 4 and Y 1 to Y 4 (however, four rings each consisting of A, X, and Y) Are not simultaneously aromatic rings, and when all four rings of A, X and Y are simultaneously pyridine rings, any one of the atoms adjacent to each X and Y in the ring And when all four rings of A, X and Y are simultaneously pyrazine rings, both atoms adjacent to each X and Y in the ring are nitrogen atoms. The ring is excluded). At least one of A 1 to A 4 are, or at least one of the substituents of A 1 to A 4 has an ionic hydrophilic group. M represents H, a metal element, a metal oxide, a metal hydroxide, or a metal halide. [Selection figure] None |