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State whether the following is true or false.
A single optical brightener can be used on any fibre.

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

Answer: B

Affinity for the substrate is required, exactly as it is for a dye, so a cotton brightener has no substantivity for polyester. A blend usually needs a combination of two products. Substantivity is fibre specific in both cases.

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