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Drying colored cloth Chemical structure of indigo dye, the blue coloration of blue jeans.Although once extracted from plants, indigo dye is now almost exclusively synthesized industrially. [1]A dye is a colored substance that chemically bonds to the substrate to which it is being applied. This distinguishes dyes from pigments which do not chemically bind to the material they color.
Nevertheless, studies of these dyes in the 1800s provided a base for development of synthetic dyes, which dominated the market by 1900. Two natural dyes, alizarin and indigo, have major significance. Alizarin is a red dye extracted from the roots of the madder plant, Rubia tinctorium. Two other red dyes were obtained from scale insects.
Learn about the history, classification, and sources of natural and synthetic dyes, and their applications and properties. Find out how dyes are used to color textiles, plastics, foods, and more.
Dyes and Pigments is an international journal on the dyes, pigments and their intermediates. It publishes papers on all aspects of the scientific and technical of the chemistry and physics of dyes, pigments and their intermediates.. Dyes and Pigments aims to interest a wide variety of workers in a range of disciplines whose work involves dyes, pigments and their intermediates, and provides a ...
Learn about different types of dyes based on their source, ionic nature, chromophoric groups, and chemical structure. Understand the basic theory and mechanism of dyeing, and the application of dyes on various fibers.
Dyes can be classified by their substantivity, which depends, in part, on the nature of the substituents in the dye molecule. Attractive ionic interactions are operative in the case of anionic (acid) and cationic (basic) dyes, which have negatively and positively charged groups, respectively. These charged groups are attracted to sites of ...
Unlike most organic compounds, dyes possess colour because they 1) absorb light in the visible spectrum (400-700 nm), 2) have at least one chromophore (colour-bearing group), 3) have a conjugated system, i.e. a structure with alternating double and single bonds, and 4) exhibit resonance of electrons, which is a stabilizing force in organic compounds (Abrahart, 1977). When any one of these ...
Natural dyes are dyes or colorants derived from plants, invertebrates, or minerals. The majority of natural dyes are vegetable dyes from plant sources—roots, berries, bark, leaves, and wood—and other biological sources such as fungi. [1] Archaeologists have found evidence of textile dyeing dating back to the Neolithic period.
Learn about the origins and evolution of dyes from plants, animals, and minerals in different cultures and regions. Explore how dyes were used to colour textiles, wood, pottery, and animal hides, and how they were traded and exchanged along ancient routes.
Natural dyes have been used for centuries due to their eco-friendliness, ready availability, affordability, and non-toxicity• The application of synthetic dyes comes with significant environmental and health challenges.• Many indigenous plants have varying colors and properties which can be exploited as potential sources of natural dyes• Hence, natural dyes are fast gaining popularity as ...