Discussion
Consider the following statements about bleaching blends.
1. The cotton component needs the bleach and the polyester generally does not.
2. Conditions must avoid damaging either fibre.
3. Polyester requires the same peroxide treatment as cotton.
Answer: C
Correct answer: 1 and 2 only
Statements 1 and 2 describe the requirement correctly: only the cotton carries natural colouring matter needing removal, and the conditions must be gentle enough not to hydrolyse the polyester while still bleaching the cotton. Statement 3 is wrong - polyester needs no bleaching at all in the ordinary case, and where its whiteness must be improved that is done with an optical brightener rather than an oxidising bleach.
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