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Discussion

Metamerism between a fabric and its printed shade card arises because

  • A.a different instrument was used to read the fabric
  • B.the observer views them at different field sizes
  • C.the two use different colourants on different substrates
  • D.the shade card was printed under a different illuminant

Answer: C

Printing inks and textile dyes have quite different spectral curves. Shade cards are consequently a poor standard for critical matching. Ink and dye differ spectrally throughout. A dyed standard is preferable for approval.

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