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A pair with a high metamerism index but a low colour difference under the reference is

  • A.impossible
  • B.a good match under the reference that will fail elsewhere
  • C.a poor match under every condition of viewing
  • D.an unconditional or spectral match between the two samples

Answer: B

Correct answer: a good match under the reference that will fail elsewhere

This combination is the classic metameric failure and the reason both figures are needed. Under the illuminant the recipe was formulated for, the batch looks right; move it to the customer’s shop lighting and the difference appears. The colour difference alone would have passed it.

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