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A CIE whiteness value greater than 100 indicates that the sample

  • A.contains an error in the calculation that must be traced and fixed
  • B.is bluer than the perfect diffuser rather than more reflective
  • C.reflects more total light than the perfect reflecting diffuser
  • D.has been measured with an incorrectly calibrated instrument source

Answer: B

Values above 100 arise from the positive chromaticity terms and are entirely normal for whitened samples. They signify a blue shift, not a violation of energy conservation, since Y itself remains at or below one hundred.

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