Discussion
Match each water impurity with the problem it causes in a textile mill.
List I
A. Calcium and magnesium
B. Iron
C. Copper
D. High alkalinity
List II
1. catalytic degradation during peroxide bleaching
2. insoluble lime soaps and dye precipitates
3. shifts the pH of dyebaths away from specification
4. yellow or brown stains and catalytic fabric damage
Answer: D
Each impurity affects a different stage of processing, so a single specification cannot cover them all. Iron and copper matter far below the levels at which hardness becomes a problem. Each has its own place in the specification.
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