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Ultraviolet control in an instrument is required when measuring

  • A.samples of very low reflectance in the visible
  • B.samples with a high gloss surface finish
  • C.samples that are entirely opaque to light
  • D.samples containing fluorescent whitening agents

Answer: D

The amount of ultraviolet determines how much the brightener fluoresces. An adjustable filter is set so the source matches the reference illuminant. Brightener response depends directly upon it. The setting must match the reference illuminant.

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