Dyestuffs And Pigments

Dyestuffs refer to organic substances that can color fibers and other materials firmly. There are many types of dyes, which can be divided into natural dyes (such as vegetable dyes, animal dyes, mineral dyes, etc.) and synthetic dyes (or artificial dyes) according to their sources. According to the molecular structure, it can be divided into azo dyes, anthraquinone dyes, phthalocyanine dyes, arylmethane dyes, nitro dyes and so on. According to the application method, it is divided into acid dyes, basic dyes, sulfur dyes, reactive dyes, disperse dyes, direct dyes, etc. Dyes have colors, but colored substances are not necessarily dyes. The dye must have a chromophore and an auxiliary chromophore. The dye in the ink should also have water-soluble groups such as sulfonic acid groups.