Requirements for acetic anhydride suitable for industrial purposes. Colour, distillation range, ash, inorganic chlorides, inorganic sulphates and anhydride content. Methods of test in appendices.
https://bsol.bsigroup.com/Bibliographic/BibliographicInfoData/000000000000085412
https://www.en-standard.eu/bs-2068-1970-specification-for-acetic-anhydride/
