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All of the following are ways of raising the apparent whiteness of a fabric EXCEPT

  • A.increasing the weight of the fabric
  • B.oxidative bleaching of the colouring matter
  • C.adding an optical brightening agent
  • D.a slight blue tint to offset the yellow

Answer: A

Fabric weight has no bearing on how white the cloth looks. The other three are the three approaches actually used, and they are often combined in a single recipe. Brighteners work by fluorescence rather than by removal.

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