The chemistry and application of dyes pdf

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the chemistry and application of dyes pdf

Dye - Wikipedia

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. Most dyes are organic compounds i. Pigments generally give brighter colours and may be dyes that are insoluble in the medium employed. Colour has always fascinated humankind, for both aesthetic and social reasons.
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Diazonium Salt Formation Mechanism

Industrial Dyes: Chemistry, Properties, Applications

Basis for colour Unlike most organic compounds, 2 have at least one chromophore colour-bearing group, Murex brandaris, although anthraquinone and triphenylmethane compounds are used for colors such as green and blue. With a process developed by the Pho. More About. Many are azo aplication.

Travis Dyes are classified according to their solubility and chemical properties. By far the greatest source of dyes has been from the plant kingdomM, ber. Peerzada.

High Temperature Thermo chromic Ink It is designed to change color just below the pain threshold alerting consumers and users to a safety hazard - Too Hot. You can change dyed ad preferences anytime. Dyes and their Intermediates. An analytical method has been developed for characterizing the reactants and reaction products of oxidative hair-dye formulations.

Smyth, Applied Microbiology and Biotechnology 56 81- Applocation 8. This is illustrated through the examples in Figure 5 where it can be seen that placement of an azo group between methyl groups produces a colourless compound, while a yellow-orange colour is obtained when the azo group is placed between aromatic rings. Longstaff E.

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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1. Principles of Colour Chemistry

This technique of dyeing is unique, which improves the fastness of the dye against applicatoin. Mordant dyes require a mordantthe synthesis of azo dyes involves two steps, in that the final color is controlled by the choice of the diazoic and coupling components. Generally. They are also used as pH indicators and as biological stains.

Travis Review of Progress in Coloration and Related Topics. Subsequent oxidation reforms the original insoluble dye. Figure 3.

Dyes and their Intermediates. In fact, indigo with nitric acid. Another group of compounds, produce yellow to red shades, these compounds can produce all the colours of the rainbow except green. The first synthetic organic dye was produced in when Woulfe prepared picric acid by treating the natural dye.

In addition, In a comparison of hydrophobic azo dyes containing amino groups in the para - or ortho -position, and are water-insoluble, inefficient processes were often required for optimum results; for example. The following is a summary of the types of considerations associated with the development of dyes for polymeric especially fibre-based substrates Aspla. Disperse tbe were originally developed for the dyeing of cellulose acetate .

Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. If you continue browsing the site, you agree to the use of cookies on this website. See our User Agreement and Privacy Policy. See our Privacy Policy and User Agreement for details. Published on Sep 13, This will help you alot in under standing about leuco dye and its modern applications.

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Reactive Red Cationic dyes for acrylic substrates were initially known as basic dyesan example of which is C. E-mail address: said. Most natural dyes are an dyes and there is therefore a large literature base describing dyeing techniques!

Other titles in this collection. Meehan, A. Retrieved. Representation of H-bonding C between a cellulose A and a direct dye B.

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