Discussion
Assertion (A): Matching a shade across two different fibre types is inherently metameric.
Reason (R): The same dye behaves differently on different fibres and different dyes must be used.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. A dye that works on cotton will not fix on polyester, so a shade matched across the two fibres must be built from different dyes with different absorption spectra. The curves therefore cannot coincide, and the match is metameric from the outset - which is why two-fibre garments are assessed under several illuminants as a matter of course.
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