Water-based ink composition for brush pens and built-in ink cartridges for brush pens and brush pens

摘要

PROBLEM TO BE SOLVED: To provide a water-based ink composition for a brush pen which makes it possible to form a brush stroke having a deep black color, vividness and suppressed bleeding, and to improve the drying property of the brush stroke, and for a brush pen and a brush pen containing the same. To provide an ink cartridge. A brush pen 1 containing a self-dispersing carbon black, a surfactant having a specific acetylene bond, and water for a brush pen, and further incorporating the water-based ink composition for a brush pen. And the ink cartridge 2 for a brush pen. [Selection diagram] Fig. 1