An ink composition comprising at least one dye represented by one of the following chemical structural formulae and an anthraquinone-based pigment as coloring materials, an alcohol or an ether as a solvent, and a resin. In a preferred embodiment, a triarylmethane-based dye is used in combination or polyvinylbutyral is contained as the resin. ##STR00001## wherein A is a tertiary or quaternary ammonium ion group.