1) Dyeing fixatives 
mordant, mordanting, mordanted, mordants 1. Bitingly sarcastic: mordant satire. 2. Incisive and trenchant. 3. Bitingly painful. 4. Serving to fix colors in dyeing, as with a reagent, such as tannic acid, that fixes dyes to cells, tissues, or textiles or other materials. 5. A corrosive substance; such as, an acid, used in etching.