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Colour difference formulae are generally not recommended for

  • A.differences large enough to be described as different colours
  • B.small differences lying near the acceptability threshold itself
  • C.differences between batches of the same shade
  • D.pass fail decisions in routine production

Answer: A

They were fitted on small difference data and extrapolate poorly. A Delta E of thirty conveys little beyond the fact that the colours are different. The formulae were fitted on small differences. Extrapolation beyond that range is unsound.

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