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Colour matching for pigmented plastics is complicated by

  • A.the sheer impossibility of measuring any plastic sample at all
  • B.the lack of any standard observer for plastics
  • C.the scattering of the pigments and the effect of the polymer
  • D.the absence of any colourant in the system

Answer: C

Two constant theory and careful sample preparation are both required. Processing conditions can also alter the dispersion and hence the colour. Two constant theory is required for pigments. Dispersion affects the colour developed.

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