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Instrument agreement affects colour difference work because

  • A.colour differences cannot be measured instrumentally
  • B.the observer rather than the instrument reports the final value
  • C.two instruments may report different values for the same pair
  • D.instruments never disagree once they are calibrated

Answer: C

Inter-instrument agreement is typically better for differences than for absolute values. Measuring standard and batch on the same instrument removes much of the disagreement. Systematic errors largely cancel in a difference.

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