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Mixing all three subtractive primaries at full strength should in theory give

  • A.the colour of whichever colourant is present in excess
  • B.black, since every part of the spectrum is absorbed
  • C.white, since all three colourants are combined
  • D.grey, since the absorptions partly cancel one another

Answer: B

In practice the result is a muddy dark brown rather than a true black. Real inks are not ideal absorbers, which is why a separate black is added in printing. Ideal absorbers do not exist in practice. A fourth ink is added for that reason.

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