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Assertion (A): Substituting a colourant almost always introduces metamerism.
Reason (R): Different colourants have different spectral absorption curves.

  • A.A is false but R is true
  • B.Both A and R are true, and R is the correct explanation of A
  • C.Both A and R are true, but R is not the correct explanation of A
  • D.A is true but R is false

Answer: B

Both are true and the reason gives the mechanism, and the tristimulus match can still be achieved. It is the spectral curve that will differ. A tristimulus match remains achievable nonetheless. The curve is what will differ between them.

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