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Perceptually, a preferred white is generally one that is

  • A.of moderate reflectance with a pronounced greenish undertone to it
  • B.light, of high reflectance, and slightly blue rather than neutral
  • C.as close to a perfectly neutral grey as the material will allow
  • D.very high in reflectance but distinctly warm and creamy in appearance

Answer: B

Observers asked to select the whitest sample from a set consistently prefer one with a slight blue cast over an exactly neutral one of the same luminance. This preference is why every practical whiteness formula rewards a small negative b* rather than zero.

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