Reactive black dye composition and method for dying fibers using the same

Pigment dispersion, method for manufacturing toner, aqueous ink, and triazo compound

Azo direct dyes and method for dyeing hair using these dyes

Chemosensors for hydrogen sulfide

Ink composition, inkjet recording ink composition, ink set, ink cartridge, inkjet recording method and recorded matter

Method of coloring with capped diazotized compound and coupling component