Patent ID: 8257479

Claim:
A water-based ink for ink-jet recording comprising: a coloring agent; and water, wherein the coloring agent comprises a dye represented by the following general formula (1), and the ink further comprises a substance having a structure in which a carbon atom and a nitrogen atom are covalently bound; wherein the substance is at least one of 1,3-bis[1,1-bis(hydroxymethyl)-2-hydroxyethylamino]propane, 2-[bis(2-hydroxyethyl)amino]-2-(hydroxy methyl)-1,3-propanediol, lysine, and arginine; wherein in the general formula (1), R 1 , R 2 , Y 1 , and Y 2 each represent a monovalent group, and R 1 , R 2 , Y 1 , and Y 2 may be the same or different; X 1 and X 2 each represent an electron attracting group, and X 1 and X 2 may be the same or different; Z 1 and Z 2 each represent a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heterocyclic group, and Z 1 and Z 2 may be the same or different; and M represents a hydrogen atom or a cation.