Читать книгу Sustainable Practices in the Textile Industry - Группа авторов - Страница 22

Mordants (from the Latin verb “modere” meaning “to bite”) are natural salts that can form a stable molecular coordination complex with both dye and fiber. Natural dyes and their use in dyeing is the most ancient art of all times. Most of the natural dyes have very low affinity towards fabric, therefore a fixing agent is required to attach dye on fabric. Mordants are substances that are able to form complexes with molecules of dyes. Mordants can be applied before dyeing, after dyeing or within dyeing mixed in a dye pot. Process of Mordanting improves the color fastness properties of dyed fabric. Mordants are classified in three categories such as Metallic mordants, Tannins and Oil mordants [39]. The fourth category is bio-mordant, which is generally obtained from natural resources.