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A colour matching system reports a recipe with a high metamerism index. The colourist should

  • A.ignore the index entirely as it has no practical meaning
  • B.reduce the number of colourants in the recipe
  • C.consider an alternative recipe with a better spectral fit
  • D.accept it since the tristimulus match is exact

Answer: C

A high index warns that the match will fail under other lighting. The customer will see the goods under conditions the laboratory did not use. A high index is a genuine warning. An alternative recipe should be considered.

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