Discussion
Consider the following statements about pH in textile processing.
1. Reactive dyeing of cotton is carried out under alkaline conditions.
2. Acid dyes on wool require an acidic bath.
3. The pH of the water supply has no bearing on either.
Answer: D
The first two are correct and are basic dyeing practice. The third is wrong, since the alkalinity of the supply changes how much acid or alkali is needed to reach the working pH. Both extremes demand control of the water supply.
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