Discussion
Arrange the stages of a continuous peroxide bleaching range in order.
1. wash out the spent liquor and impurities
2. saturate the fabric with the bleach liquor
3. neutralise and dry the fabric
4. steam it in a J-box for the required dwell
Answer: B
Correct answer: 2 - 4 - 1 - 3
The fabric is saturated with the liquor, held hot in the J-box for the dwell time the reaction needs, then washed to remove the spent liquor and the dissolved impurities, and finally neutralised and dried. Washing before the dwell would remove the bleach before it had acted, and drying before washing would fix the impurities into the cloth.
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