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Assertion (A): An unconditional match usually requires the same colourants.
Reason (R): Only identical colourants produce identical spectral reflectance curves.

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

Answer: C

Both are true and the reason gives the requirement, and different colourants give different curves. This is why substituting a colourant almost always produces a metameric match. Substitution changes the spectral curve.

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