Akademik

dye with a high affinity for cellulose fibers (cotton or rayon etc.)

: a water-soluble dye usually of the azo class that is used in alkaline or neutral solution especially for dyeing cellulosic material (as cotton or paper) directly — see dye table I

direct dye,

a dye that does not require fixing with a mordant. It is used chiefly on cellulose fibers.