Carbonizing is a chemical process that removes vegetable matter from wool using acid treatment, producing a cleaner fiber than scouring alone — making this grade particularly valued by worsted and woolen spinners who need low vegetable-matter content. Degreased, carbonized wool in this unprocessed state sits at an early stage of the textile supply chain, before carding or combing align the fibers for spinning. Importers should note that classification hinges on the fiber remaining in loose, non-aligned form; any subsequent carding or combing shifts the product to a different heading.

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