Discussion
Assertion (A): Physical colour standards must be renewed periodically.
Reason (R): Light, heat and handling all cause them to change over time.
Answer: C
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 physical standard fades under light, yellows with heat, and picks up soiling and surface change from handling, so the reference itself drifts. Standards are therefore stored in the dark, issued with a date, and replaced on a schedule - and the master is measured rather than merely looked at.
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