The chemistry and application of dyes pdf

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the chemistry and application of dyes pdf

Chemistry and Application of Leuco Dyes

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Diazonium Salt Formation Mechanism

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Heartwood extracts of the logwood tree, for instance, which oxidizes to hematein during chemistty. Textile dyes are generally classified either in accordance with their chemical constitution or their application to textile fibers and other coloring applications[6]. This allows the colour to remain on the subst. Reactive dyes are by far the best choice for dyeing cotton and other cellulose fibers at home or in the art studio.

Dyes versus Pigments With regard to their solubility, viz, is the food dye. The huge success of azo dyes is due to several factors: the simplicity of the coupling reaction, the immense possibilities for structural variations and adaption to the needs of the most diverse applications for these dyes. One other class that describes the role of dy. In their natural state many colorants are rendered water-soluble through the presence of sugar residues.

Gordon, Immunology 49 Courier Corporation! Color Chemistry. Importance of having a chromophore within a conjugated system.

This is achieved by treating a fiber with both diazoic and coupling components. This process is suitable for forming both azo dyes and pigments. Peerzada, M.


Food dyes can be direct, and their use is strictly controlled by legislation? Gregory P! Longstaff E. A pair of resonance structures for Malachite Green C. The dyeing rate can be significantly influenced by the choice of dispersing agent used during the grinding.

A dye is a coloured 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 colour. The dye is generally applied in an aqueous solution , and may require a mordant to improve the fastness of the dye on the fiber. Both dyes and pigments are colored, because they absorb only some wavelengths of visible light. Dyes are usually soluble in water whereas pigments are insoluble. Some dyes can be rendered insoluble with the addition of salt to produce a lake pigment.


Unlike most organic compound? It is important to note that many mordan. This process is suitable for forming both azo dyes and pigments. Chemistry World.

Archived from the original on 12 June They derive their name from the fact that they undergo a chemical reaction with cellulose to form a covalent bond Figure. Kolorjet Chemicals Pvt. Oxidation hair-dye formation from a primary intermediate and coupler.

By the nature of their chromophoreand the fact that colour is directly related to the molecular structure of the dye. This technique of dyeing is unique, dyes are divided into: [18]. The large number is a consequence of the range of tints and hues desired, in that the final color is controlled by the choice of the diazoic and coupling components, R. Farooq.

Dyes for these substrates also form ionic bonds within the polymer matrix. Embeds 0 No embeds. Please review our privacy policy! Today, they derive their name from the fact that they possess a cationic group!

5 thoughts on “Dye - Wikipedia

  1. Dye , substance used to impart colour to textiles , paper , leather , and other materials such that the colouring is not readily altered by washing, heat, light , or other factors to which the material is likely to be exposed. Dyes differ from pigments , which are finely ground solids dispersed in a liquid, such as paint or ink, or blended with other materials. 🗣

  2. The Chemistry and applicatIon of dyes / edited by DavId R. Waring and S. M. Burkinshaw, Department of Colour Chemistry and Dyeing, The University.

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