substantive dye(n = noun.substance) direct dye - dye with a high affinity for cellulose fibers (cotton or rayon etc.);
is a kind of dye, dyestuff

acid dye, aniline dye, azo dye, basic dye, cyanine dye, direct dye, double dye, dye, fast dye, fluorescent dye, hair dye, lac dye, metallized dye, radiopaque dye, substantive, vat dye