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How wool is made

Dyeing & Bleaching


Dyeing and bleaching of wool can be and is carried out at many stages throughout manufacturing. Where it is carried out is dependent upon a number of factors, including effect required, lot sizes, effect on aesthetic qualities, need for quick response and economics.

Colouration

Although there are exceptions, wool is dyed or bleached at the following stages:

Most dyes for wool are anionic (negatively charged) in their chemical nature, and the rate of dyeing is controlled primarily by controlling both the pH and the rate in the rise in the temperature of the dye bath liquor.

The keys to successful dyeing and bleaching depends upon a combination of achieving as accurately and consistently as possible, the correct shade, uniformity (levelness), meeting the colour fastness requirements, at both the least cost and damage to the environment.