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The commonest practical error in thinking about colour mixing is to

  • A.believe that light cannot be mixed additively
  • B.treat all colourants as perfectly transparent
  • C.apply additive reasoning to a subtractive situation
  • D.assume that colourants can never be mixed together at all

Answer: C

Expecting red and green paint to give yellow is the familiar instance. The two processes obey different rules and produce different results. Red and green paint gives brown, not yellow. The two processes must not be confused.

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