DOUBLE-COLOR INK AND WRITING UTENSIL CONTAINING THE SAME

摘要

A double-color ink capable of stably forming a double color over long, which comprises (1) a metallic powder pigment, (2) water, (3) at least one water-soluble organic solvent selected among alcohols having a branched hydrophobic group, glycols, and glycol ethers, and (4) at least one water-soluble dye selected among anthraquinone dyes, carbonium dyes, and metal complex dyes; and a writing utensil containing the ink.