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Fibre damage during bleaching is assessed by

  • A.weighing the fabric afterwards
  • B.an absorbency drop test
  • C.measuring copper number or fluidity
  • D.a whiteness measurement made on it

Answer: C

Both tests detect oxycellulose, which forms when the bleach attacks the fibre rather than the colour. A tensile test confirms the damage but is less sensitive at low levels. Oxycellulose is the product of over-bleaching.

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