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What Is A Dye?

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Akshay Kalbag answered
A dye is usually a soluble coloured substance used for staining or colouring. To dye, is to colour something with a dye. A dye is a coloured substance that develops an affinity to the substrate on which it is applied. It is soluble in water and may require a mordant to improve its fastness on the fibre.

A pigment is different from a dye. A pigment is an insoluble substance and does not have any affinity to the substrate on which it is applied. A dye is an ink colourant that is soluble in vehicle or solvent. Dyes can also be oil-soluble colourants are used for colouring the core. Dyes are soluble colourants and are less stable than pigment colourants, but they produce a greater, more vivid palette of colours. They are usually organic substances and need to absorb, be absorbed by, be made to react with, or be deposited within the substrate in order to impart a permanent colour to the substrate.

Dyes are compounds that impart a specific colour to the substrates. It fades or dissolves faster than a pigment, and is added to paper, textiles and ink. They are used as additives in the pharmaceutical industry to alter the colour of the drugs and differentiate it from other similar varieties of drugs having active substances, and sometimes also to differentiate it from drugs of various concentrations containing the same active substance.

Dyes may be natural or synthetic. Natural dyes are extracted from berries, flowers, etc., whereas synthetic dyes are chemical compounds. Dyes are opaque to x-rays.

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