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Blueing of a fabric or paper works by

  • A.adding energy to the blue part of the reflected spectrum by emission
  • B.increasing the overall reflectance factor across the whole spectrum
  • C.converting invisible ultraviolet radiation into visible blue light
  • D.absorbing a little yellow light so the material appears less yellow

Answer: D

A blueing agent is a very dilute blue or violet colourant. It removes a little of the yellow light that made the substrate look creamy, so the sample looks whiter. Because it subtracts light, blueing always lowers the luminance slightly.

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