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Reductive bleaching with dithionite is used chiefly for

  • A.cotton in continuous ranges only
  • B.linen and jute fabrics only
  • C.any fibre needing a permanent white
  • D.wool and some synthetic fibres

Answer: D

Protein fibres are damaged by oxidising bleaches, so a reducing agent is used instead. The white is less permanent, which is why wool often receives a combined oxidative and reductive treatment. Peroxide alone yellows the keratin.

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