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State whether the following is true or false.
A reductively bleached fabric may yellow again on exposure to air.

  • A.True
  • B.False
  • C.True only at large scales
  • D.False only at small scales

Answer: A

The reduction is reversible, so atmospheric oxygen can regenerate part of the colour. This is why the combined treatment or an optical brightener is often used alongside it. The effect is reversed by atmospheric oxygen.

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