Question

What happens if cocoon is not boiled?

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Answer 1

If cocoon is not boiled, the fibres obtained will be brittle, and we will get fragments of the thread instead of a long continuous silk thread.

Answer 2

Boiling the cocoon helps to dissolve the adhesive that sticks the fibres together. If cocoon is not boiled, the fibres obtained will be brittle, and we will get fragments of the thread instead of a long continuous silk thread.