Discussion
The caustic must be washed off while the fabric is still under tension because
Answer: A
Correct answer: releasing the tension early loses the lustre
The reorganised structure is not fixed until the caustic has been washed out. Release the tension while the fabric is still swollen and it shrinks, the fibres lose the alignment and the round cross-section, and the lustre goes with them - irrecoverably. The stretched fabric is therefore carried through the wash boxes on the chain or between rollers and only released once the caustic is removed.
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