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All of the following are subtractive processes EXCEPT

  • A.mixing two paints in a tin before application
  • B.stacking two coloured filters in a light beam
  • C.printing one transparent ink over another
  • D.overlapping two coloured spotlights on a wall

Answer: D

Overlapping lights add their spectra rather than removing wavelengths. The other three each remove part of the spectrum successively. Overlapping lights add their spectra instead. Only the first three remove wavelengths.

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