A dye represented by the following formula (1);
 wherein A represents an acidic nucleus, L1, L2 and L3 represent a methine group, n represents 0, 1 or 2, Z represents a nonmetalic atom group necessary to form a heterocyclic group by bonding with a nitrogen atom included in the above formula (1), Y represents a substituent represented by the following formula (2) or a heterocyclic group;
 wherein R1 and R2 represent an alkyl group, and R1 and R2 may form a ring by bonding with each other, R3 represents a hydrogen atom or an electron withdrawing group:
said dye represented by the above formula (1) has at least one carboxy group or one alkylsulfonamide group in an aromatic ring portion of its molecular structure.
                            由下式(1)代表的
染料;
 其中 A 代表一个酸性核,L1、
L2 和 L3 代表一个亚甲基,n 代表 0、1 或 2,Z 代表一个非
金属原子基团,通过与上式(1)中包含的氮原子结合形成杂环基团,Y 代表下式(2)所代表的取代基或杂环基团;
 其中 R1 和 R2 代表烷基,且 R1 和 R2 可通过相互键合形成环,R3 代表氢原子或取电子基团:
上述式(1)代表的
染料在其分子结构的芳香环部分至少有一个羧基或一个烷基磺酰胺基团。