Dye | Dyeing | Pigment

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Dye

A dye or dyestuff is a colored and organic chemical compound which have affinity to substance like textiles, absorbs light strongly in visible region and create physical and chemical bond with the fibres. Dye must contain chromophore and auxochrome group. In case of organic compounds sometimes they have some molecules with pi-bond e.g. -NO, -NO₂ , -N=N- etc. for which the compounds become colored and  the molecules with pi-bond are called chromophore. Auxochrome is attached to chromophore to modify its absorption of light. –OH, -CHO etc. are auxochrome.

Dyeing

Dyeing is a process for which the physical and chemical properties of a material changes and it is the penetration of clolor to material to be dyed. As a result an uniform and even color is created.

Pigment

Pigment is a colored particle which absorbs light more than other materials and have some special properties. Pigments contain chromophore group but not auxocrome group. The color that is  absorbed by pigment is shown by the materials. That means pigment is the source of color. Actually, pigment is the concentration of color on the material where if the amount of pigment is high, then the material looks bright colored.