WATER-BASED BLACK INK COMPOSITION AND COLORED MATERIAL

摘要

[Problems] To provide a black compound for ink-jet recording and for writing tools and having excellent in ozone gas fastness, light fastness, moisture fastness and color rendering properties, and as a recording liquid, storage stability is excellent and an ink composition containing thereto. [Solving Means] An ink composition containing an azo compound represented by the following Formula (1) and a salt thereof. (see formula ka1) (see formula 1)