Aqueous ink of pigment type

An aqueous ink, comprising:

• a pigment, water, a water-soluble solvent, a sulfite and a dispersant which is member selected from the group consisting of an anionic surface-active agent, a cationic surface-active agent, an amphoteric surface-active agent, a nonionic surface-active agent, protein, a natural rubber, a glucoxide, a cellulose derivative, a lignin, sulfonate, a natural polymer, a nonioinic polymer and a copolymer of a monomer (a), represented by the formula (A), and one or more monomers (b) selected from the group consisting of compounds represented by formulae (B) and (C):
• ##STR4## wherein R.sub.1, and R.sub.2, which may be the same or different, each represent a hydrogen atom or a methyl group, m.sub.1 represents an integer of 0 to 2, AO represents an oxyalkylene group having 2 to 3 carbon atoms, n represents an integer of 110 to 300, and X represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, ##STR5## wherein R.sub.3, R.sub.4 and R.sub.5, which may be the same or different, each represent a hydrogen atom or a methyl group or (CH.sub.2)m.sub.2 COOM.sub.2, R.sub.6 represents a hydrogen atom, a methyl group, M.sub.1, M.sub.2 and Y, which may be the same or different, each represent a hydrogen atom, an alkali metal, an alkaline earth metal, ammonium, an alkylammonium or a substituted alkylammonium, m.sub.2 represents an integer of 0 to 2, with the compounds represented by the general formula (B) including acid anhydrides thereof, wherein the weight ratio of pigment to sulfite ranges from 1/10 to 10/1.