mordant

peittausaine

syövyttävä

pureva, pisteliäs, terävä Having or showing a sharp or critical quality; biting; caustic; sarcastic; keen; severe.
Any substance used to facilitate the fixing of a dye to a fibre; usually a metallic compound which reacts with the dye using chelation.
1964, In dyeing two mediums are required, the colouring matter and the mordant which fixes the dye in the wool. — w:en:Louis Francis Salzman|L.F. Salzman, English Industries of the Middle Ages, p. 208.
Any corrosive substance used in etching.
puhekieltä To subject to the action of, or imbue with, a mordant.

Mordant these goods for dyeing.