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Consider the following statements about the chromaticity diagram.
1. The curved boundary is the spectrum locus.
2. The straight closing line consists of non-spectral purples.
3. Colours outside the boundary are simply very saturated.

  • A.3 only
  • B.1 only
  • C.All of them
  • D.1 and 2 only

Answer: D

The first two are correct and describe the geometry. The third is wrong, since points outside the boundary do not correspond to any realisable colour whatever. The boundary is an absolute limit, not a saturation scale.

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