Thio-urea bleaching of wool

4 Bleaching of wool with thio-urea dioxide 

The optimum bleaching value of wool can be achieved at thio-urea dioxide 

time 30 min and temperature 80 C. The cost of bleaching with thio-urea dioxide is claimed to be three times lesser than that of bleaching carried out with sodium hydrosulphite. Also, its lack of mutagen activity and its low COD and BOD values recommended it as a non-toxic product giving a low concentration of effluents. 

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