What is another word for film base?
Pronunciation: [fˈɪlm bˈe͡ɪs] (IPA) 
Film base is a term that refers to the underlying material upon which photographic film is manufactured. While "film base" is a commonly-used term, there are several synonyms that can be used interchangeably, such as "film substrate," "film stock," "film backing," or simply "base." These terms all refer to the same basic material that serves as the foundation for photographic film, whether it be cellulose acetate, polyester, or another material. While there may be some minor differences in the composition of various film bases, all serve the same essential function of providing a stable surface upon which the film's emulsion can be coated.
