Ink composition, inkjet recording ink composition, ink set, ink cartridge, inkjet recording method and recorded matter

An ink composition comprising:

• a compound represented by the following formula (1);
• an ingredient (C);
• and
• a moisture-retentive agent,
• wherein the content of compound represented by the formula (1) is from 0.1 mass % to lower than 7.0 mass %,
• the content of moisture-retentive agent having 3 or more hydroxyl groups is 10.0 mass % or lower,
• the molar ratio of the moisture-retentive agent having 3 or more hydroxyl groups to the compound represented by the formula (1) is lower than 30.0:
• wherein each of Ar1 and Ar2 independently represents an aromatic cyclic hydrocarbyl group, a nonaromatic cyclic hydrocarbyl group, an aromatic heterocyclic group or a nonaromatic heterocyclic group;
• each of A1 and A2 independently represents a hydrogen atom or a substituent which may further have a substituent;
• Y represents —OM or —NR1R2;
• M represents a hydrogen atom or a metal ion;
• and
• each of R1 and R2 independently represents a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aralkyl group, an aryl group or a heterocyclic group,
• wherein the ingredient (C) is at least one compound selected from the group consisting of compounds represented by the following formulae (2), (3), (4), (5) and (6):
• wherein each M in the formulae (2) to (5) represents a hydrogen atom or a metal ion;
• R in the formula (2) represents a hydrogen atom or a methyl group;
• and
• M′− in the formula (6) represents a halogen ion, an inorganic anion or an organic anion.