Dye

Dye is a substance used to color materials. It is often used to color the fabric used to make clothing. It has low solubility. A pigment will not do this because it will not stick to the fibers of the fabric and color them. A dye can be natural, usually made from plant material such as berries, or a dye can be artificial, meaning that it is made by humans from chemicals such as petrochemicals.

Most natural dyes are gotten from different parts of a plant like the roots, fruits, bark, leaves, wood, fungi and lichens. Most dyes are synthetic and are made from petrochemicals.

Classification
Dyes can be classified based on their solubility and chemical properties. 

 Acid dyes can dissolve in water.  They are used on fibers such as silk, wool, nylon.  Most food coloring that are made by man are acid dyes.  Examples of acid dye are Alizarine Pure Blue B, Acid red 88, etc.
 Basic dyes can dissolve in water.  They are mainly used on acrylic fibers.  They may also be used on wool and silk.  Basic dyes are also used to make paper colourful.

 Related pages 
Pigment
Food coloring#Natural food dyes
Hair coloring

References

Category:Color
Category:Cloth
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