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All of the following are true of a fluorescent brightener EXCEPT

  • A.it removes colouring matter from the fibre
  • B.it must have affinity for the fibre it is applied to
  • C.its effect depends on ultraviolet in the light
  • D.it has an optimum dose beyond which whiteness falls

Answer: A

Removing colour is what a bleach does, and the brightener leaves every coloured compound where it was. The other three are the three facts that govern how a brightener is chosen and applied in a mill, and each of them limits what the treatment can achieve.

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