Recipes for hydrogen peroxide bleaching developed in the CFC/FAO project. Fibre to liquor ratio 1:20 or for yarn 1:12.
Hot process
After washing with water the fibres are placed in a solution of hydrogen peroxide (8 g/l) and sodium silicate (5 g/l), and heated and kept at temperature 80-90oC for one hour, with frequent agitation. The material is taken out and washed with cold water and dried in the shade.
Cold process
After washing with water the fibres are placed at ambient temperature in the bleaching bath - a solution of hydrogen peroxide (10 g/l), sodium silicate (6 g/l), soda ash (2 g/l) and Lissapol D (2 g/l). The bleaching process is continued overnight, with frequent agitation. The bleached fibres are then taken out and washed with cold water and dried in the shade.
