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Three of the following are appropriate uses of a colour difference formula. Which is the odd one out?

  • A.monitoring drift in production over time
  • B.quantifying the small shade correction that is required
  • C.measuring the distance between two entirely different colours
  • D.deciding whether a batch is within tolerance

Answer: C

Large differences fall well outside the range the formulae were fitted on. The other three all concern the small differences they were designed for. Large differences fall outside the fitted range. The number becomes a label rather than a measure.

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