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The removal of these natural coloring matters and add-ons during the previous state of manufacturing is called scouring and bleaching. SCOURING Scouring is the first wash with or without chemicals, at room temperature or at suitable higher temperatures with the addition of suitable Wetting Agent s, Alkali and so on. BLEACHING The next process of decolorization of greige material in to a suitable material for next processing is called bleaching. Bleaching of textiles can be classified in to oxidative bleaching and reductive bleaching. Oxidative bleaching Generally oxidative bleachings are carried out using Sodium Hypochlorite , Sodium Chlorite or Hydrogen Peroxide . Natural fibres like Cotton , Ramie , Jute , Wool , Bamboo are all generally bleached with oxidative methods. Reductive bleaching Reductive method of bleaching is done with Sodium Hydrosulphite , a powerful reducing agent. Fibres like Polyamide , Polyacrylics and Polyacetates can be bleached using reductive bleaching technology. EXTERNAL LINKS
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