(A) Silk yarn and yarn spun from silk waste.
This group covers the yarns of headings 50.04 and 50.05 put up for retail sale, i.e., in the forms and subject to the conditions described in Part (¥°) (B) (3) of the General Explanatory Note to Section XI.(B) Silk-worm gut. Silk-worm gut is obtained by extracting and stretching the silk glands of silk-worms killed by immersion in diluted acetic acid at the stage when they are ready to spin their cocoons. Silk-worm gut is less flexible and glossier than horsehair, and rarely exceeds 50 cm in length. The heading does not cover : (a) Sterile silk-worm gut (heading 30.06). (b) Imitation catgut of silk, of heading 56.04. (c) Silk-worm gut fitted with hooks or made up into fishing lines (heading 95.07).
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