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Sodium hypochlorite bleaching must be followed by an antichlor treatment because

  • A.the pH would otherwise be much too high
  • B.the hypochlorite would fix the dye
  • C.residual chlorine keeps damaging the fibre
  • D.the fabric would otherwise be far too white

Answer: C

A reducing agent such as bisulphite destroys the last of the active chlorine. Without it the cloth yellows and loses strength over the following weeks, sometimes long after it has left the mill. Tendering in storage is the classic symptom.

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