This document specifies a method@ using acetone@ to determine the mass percentage of acetate@ after removal of non-fibrous matter@ in textiles made of mixtures of ?? acetate with ?? wool@ animal hair@ silk@ regenerated protein@ cotton (scoured@ kiered@ or bleached)@ flax (or linen)@ hemp@ jute@ abaca@ alfa@ coir@ broom@ ramie@ cupro@ viscose@ modal@ polyamide@ polyester@ acrylic@ elastolefin@ elastomultiester@ melamine@ polypropylene/polyamide bicomponent@ polyacrylate and glass fibres. It is not applicable to mixtures containing modacrylic fibres@ nor to mixtures containing acetate fibres that have been deacetylated on the surface.