Dithionite bleaching (Y) Common reductive bleaching chemicals used in treating recycled fibre pulp are sodium dithionite (sodium hydrosulphite) and formamidine sulphinic acid (FAS). FAS is finding increasing use primarily with wood-free recycled pulp. Reductive bleaching is essential not only for bleaching but also for colour stripping of coloured recovered paper and carbonless paper. Many of
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