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The most reliable way to avoid metamerism in production is to

  • A.use the same colourants as the standard in the same proportions
  • B.adjust the recipe until the colour difference is at its smallest
  • C.measure under a single agreed illuminant only
  • D.select observers with the best colour discrimination

Answer: A

Correct answer: use the same colourants as the standard in the same proportions

If the reflectance curves are identical, the match holds under every illuminant and every observer, because there is no spectral difference to be revealed. Every other approach controls the symptom rather than the cause: minimising the difference under one illuminant is precisely how metameric recipes come to be chosen.

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