Dyeing
Dyeing
Dyeing (pronunciation: /ˈdaɪ.ɪŋ/) is the process of adding color to textile products like fibers, yarns, and fabrics. The term originates from the Old English deag, which means color or dye.
Process
Dyeing is typically done in a special solution containing dyes and particular chemical material. After dyeing, dye molecules have uncut chemical bond with fiber molecules. The temperature and time controlling are two key factors in dyeing. There are mainly two classes of dye, natural and man-made.
Types of Dyeing
There are various types of dyeing methods available, which can be classified according to the form of the material being dyed. Some of the common types include:
- Yarn Dyeing: Yarn dyeing is done before converting the yarn into fabric.
- Garment Dyeing: Garment dyeing is done after sewing the garment.
- Fabric Dyeing: Fabric dyeing is done with the fabric before cutting and sewing the garment.
Health Implications
Some dyes, particularly those used in the past, have been found to be harmful to health. Certain azo dyes can break down under reductive conditions to release carcinogenic amines. Some dyes can cause allergic reactions in sensitive individuals.
Environmental Impact
The dyeing process often requires a lot of water and chemicals, which can be harmful to the environment. Some dyes are not easily biodegradable and can remain in the environment for a long time.
See Also
External links
- Medical encyclopedia article on Dyeing
- Wikipedia's article - Dyeing
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