Ink set

Claim 1

An ink set comprising: a yellow ink composition; first and second magenta ink compositions different from each other in color density, wherein the first magenta ink composition has a higher color density and the second magenta ink composition has a lower color density; and first and second cyan ink compositions different from each other in color density, wherein the first cyan ink composition has a higher color density and the second cyan ink composition has a lower color density, said yellow ink composition containing as a colorant a compound represented by formula (I) or (II): wherein R 1 , R 1 ′, R 2 , and R 2 ′ each independently represent CH 3 or OCH 3 ; and A and A′ each independently represent a group having a structure selected from the group consisting of wherein M represents a hydrogen atom, lithium, sodium, potassium, ammonium, or an organic amine; and n is an integer of 1 or 2, said first magenta ink composition with higher color density containing as a colorant a compound represented by formula (III): wherein B and B′ each independently represent a hydrogen atom or a group represented by formula wherein R 2 represents OH, COOM, or NHR 5 wherein R 5 represents an SO 3 M— or COOH-substituted C 1 -C 4 alkyl group; R 3 represents a hydrogen atom or an OH— or COOH-substituted C 1 -C 4 alkyl group; and R 4 represents an OH—, OCH 3 —, OC 2 H 5 —, SO 3 M—, or COOM-substituted C 1 -C 4 alkyl or phenyl group, provided that B and B′ do not simultaneously represent a hydrogen atom; R 1 represents a C 1 -C 4 alkyl or alkoxy group, OH, SO 3 M, or COOH; and M represents a hydrogen atom, lithium, sodium, potassium, ammonium, or an organic amine, said second magenta ink composition with lower color density containing as a colorant the compound represented by formula (III) or a compound represented by formula (V): wherein X represents an anilino group substituted by at least one SO 3 M; Y represents OH, Cl, or a morpholino group; and M represents a hydrogen atom, lithium, sodium, potassium, ammonium, or an organic amine, said first cyan ink composition with higher color density and said second cyan ink composition with lower color density each containing as a colorant a compound represented by formula (IV): wherein R 6 represents OH or COOM; and p, m, and n are each 0 to 4 with (p+m+n)=4.