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The emission maximum of most commercial fluorescent whiteners falls near

  • A.355 nanometres, which lies in the near ultraviolet outside vision
  • B.500 nanometres, in the blue green region of the visible spectrum
  • C.580 nanometres, in the yellow region of the visible spectrum itself
  • D.435 nanometres, in the violet blue region of the visible spectrum

Answer: D

Emission near 435 nm places the added light exactly where it compensates for the yellowness of most substrates. The complementary relationship between blue emission and yellow absorption is what produces the whitening effect.

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