Discussion
Assertion (A): A mill aiming at right first time dyeing controls its water supply closely.
Reason (R): Variation in hardness, iron or alkalinity changes the shade obtained from the same recipe.
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 causal link. Right first time dyeing means matching the standard without additions, and that requires every input to be the same each time. Water is the largest input by mass, so uncontrolled variation in it defeats the aim however carefully the dyes and chemicals are weighed - which is why water treatment is a prerequisite for the practice rather than an optional refinement.
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