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Assertion (A): Adding a fourth colourant to a recipe can reduce metamerism.
Reason (R): It provides an additional degree of freedom for fitting the curve shape.

  • 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 mechanism, and cost rises with each addition. Three colourants can match the integrals but rarely the whole curve. Matching a curve needs more freedom than matching three numbers.

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