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Dyes are a class of organic compounds that are used to color materials like paper, leather, and textiles. Here are some things to know about dyes:
Composition
Dyes are complex organic compounds with acid-base properties. They are sensitive to low concentrations of metal ions.
History
Ancient dyes came from plants like indigo and madder, or from mollusk shells. Today, most dyes are made from coal tar and petrochemicals.
Application
Dyes are applied to a substrate to which they have affinity. They are usually applied in an aqueous solution.
Fastness
A mordant may be required to improve the fastness of the dye on the fiber.
Uses
Dyes are used in many applications, including food dyes, which are soluble in water and nonaqueous hydrophilic solvents.
Difference from pigments
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Country Of Origin : India
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. Dye is generally applied in an aqueous solution and may require a mordant to improve the fastness of the dye on the fiber.
