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The interior of a colour viewing cabinet is finished in neutral grey because

  • A.grey paint is the cheapest available finish for the purpose
  • B.grey reflects more light than any other colour would
  • C.the standard observer is defined against a grey background
  • D.a coloured interior would bias the judgement by contrast

Answer: D

Simultaneous contrast from a coloured surround would shift the apparent colour. The specified grey is itself defined by a reflectance value in the relevant standard. Contrast from a coloured surround would bias judgement.

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