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When they are ready, they begin cocooning and extrude a semi-liquid mixture of protein and a sticky substance known as sericin.
This helps dissolve sericin, a gluey glycoprotein that holds the cocoons together but causes immune reactions in humans.— Medlogs - Recent stories
Silk Industry._--Silk is secured to remove the sericin or silk-glue and adhering matter from the raw silk, producing thereby lustre on the softened fibre and thus preparing it for the dyer The very best soap for the purpose is an olive-oil soft soap; olive-oil and oleine hard soaps may also be used.— The Handbook of Soap Manufacture
The soap is often used in conjunction with carbonate of soda to assist the removal of the sericin, but, whilst carbonates are permissible, it is necessary to avoid an excess of caustic soda Tallow soaps are so slowly soluble that they are not applicable to the scouring of silk The dyer of silk requires soap, which is neutral and of a pleasant odour.— The Handbook of Soap Manufacture
Cold strong acetic acid, so-called glacial acetic acid, removes the yellowish colouring matter from raw silk without dissolving the sericin or silk-gum.— The Chemistry of Hat Manufacturing Lectures Delivered Before the Hat Manufacturers' Association

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