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Acetate
Cellulose acetate is manufactured by reacting cellulose with acetic anhydride using sulfuric acid as a catalyst. This slow burning base material is frequently used for motion picture films and in sheet form for overlay cells in animation.
https://www.nfsa.gov.au/sites/default/files/uploads/2010/08/23/acetateformula.gif
The National Film and Sound Archive of Australia acknowledges Australia’s Aboriginal and Torres Strait Islander peoples as the Traditional Custodians of the land on which we work and live and gives respect to their Elders both past and present.