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wild silk
Wild silks have been known and used in many countries from early times, although the scale of production is far smaller than that from cultivated silkworms.
==Background==
Wild silk should not be confused with the very rare sea silk, which is produced from the fibres or byssus produced by the seashell ''Pinna nobilis'' and related species.
Commercially reared silkworms of the species ''Bombyx mori'' (Linnaeus, 1758) are normally killed before the pupae emerge, either by pricking them with a needle or dipping the cocoons into boiling water, thus allowing the whole cocoon to be unravelled as one continuous thread. This allows a much finer cloth to be woven from the silk.
There are more than 500 species of wild silkworms in the world, although only a few are used to produce cloth. They usually produce a tougher and rougher silk than that from domesticated ''Bombyx mori'' silkworms. Wild silks are usually harvested after the moths have left the cocoons, cutting the threads in the process, so that there is not one long thread, as with domesticated silkworms.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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