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A fluorescent whitening agent differs from a blueing agent in that it

  • A.absorbs ultraviolet radiation and re-emits it as visible blue light
  • B.is applied at a very much greater concentration on the substrate
  • C.removes yellow light from the spectrum reflected by the substrate
  • D.lifts every part of the reflectance curve by an equal amount

Answer: A

A fluorescent whitener absorbs in the near ultraviolet, roughly 340 to 380 nm, and emits in the blue near 435 nm. The emitted light adds to the reflected light, so the apparent reflectance in the blue can exceed one hundred per cent.

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