Disperse dye
From Infogalactic: the planetary knowledge core
Disperse dyes are the only water-insoluble dyes that dye polyester[1] and acetate fibers. Disperse dye molecules are the smallest dye molecules among all dyes.[citation needed]
A disperse dye molecule is based on an azobenzene (as Disperse Red 1 or Disperse Orange 37)[2] or anthraquinone[3] molecule with nitro, amine, hydroxyl, etc. groups attached to it.[1][not in citation given]