This part of ISO 1833 specifies a method, using dichloromethane, to determine the percentage of triacetate or polylactide, after removal of non-fibrous matter, in textiles made of mixtures of triacetate or polylactide with wool or other animal hair, silk, protein, cotton, viscose, cupro, modal,lyocell, polyamide, polyester, acrylic, elastomultiester, polypropylene, elastolefin, melamine, polypropylene/polyamide bicomponent,polyacrylate and glass fibres. Triacetate fibres which have been partially hydrolysed (i.e. saponification) cease to be completely soluble in the reagent. In such cases, this method is not applicable.