mordant: adjective; °Biting; caustic; sarcastic; keen; severe.; °Serving to fix colors when dyeing.

"1964, In dyeing two mediums are required, the colouring matter and the mordant which fixes the dye in the wool. — L.F. Salzman, English Industries of the Middle Ages, p. 208."; noun; °Any substance used to facilitate the fixing of a dye to a fibre; usually a metallic compound which reacts with the dye using chelation.; verb; °To subject to the action of, or imbue with, a mordant.

"mordant goods for dyeing"

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