This part of ISO 1833 specifies a method, using carbon disulfide/acetone, to determine the percentage of chlorofibre, after removal of non-fibrous matter, in textiles made of mixtures of - certain chlorofibres, whether after-chlorinated or not, and - wool, animal hair, silk, cotton, viscose, cupro, modal, polyamide, polyester, acrylic and glass fibres. When the wool or silk content of a mixture exceeds 25 %, the method described in ISO 1833-4 should be used. When the polyamide content of a mixture exceeds 25 %, the method described in ISO 1833-7 should be used.