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Discussion

Fluorescent colourants complicate recipe prediction because

  • A.they have no absorption at any wavelength
  • B.they are always used in isolation from others
  • C.they emit light as well as absorbing it
  • D.no instrument is able to read them at all

Answer: C

Ordinary Kubelka Munk theory has no term for emission at all. Special treatment and careful ultraviolet control are both required. Ordinary theory has no emission term at all. Extended models are required for fluorescence.

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