Patent ID: 8372190

Claim:
An ink set, comprising: at least a yellow ink composition; a magenta ink composition; and a cyan ink composition, wherein the yellow ink composition contains, as a yellow colorant, at least one member selected from the group consisting of a compound represented by the following formula (Y-I) and a salt thereof, each of a yellow colorant, a magenta colorant and a cyan colorant contained in the yellow ink composition, the magenta ink composition and the cyan ink composition, respectively, has at least one ionic hydrophilic group, a counter ion of the ionic hydrophilic group contains a lithium ion, and a lithium ion concentration is 70 mol % or more based on total cations in each ink composition: wherein G represents a heterocyclic group; n represents an integer of 1 to 3; when n is 1, R, X, Y, Z, Q and G each represents a monovalent group; when n is 2, R, X, Y, Z, Q and G each represents a monovalent or divalent substituent, and at least one member represents a divalent substituent; and when n is 3, R, X, Y, Z, Q and G each represents a monovalent, divalent or trivalent substituent, and at least two members represent a divalent substituent or at least one member represents a trivalent substituent, provided that formula (Y-I) has at least one ionic hydrophilic group and a counter ion of the ionic hydrophilic group contains a lithium ion.