https://www.nfsa.gov.au/sites/default/files/2023-11/Chapter%201%20Block%201000%20x%20745.jpg
The first successful, flexible film base. Often just called ‘nitrate’.
Celluloid is Celanese Corporation’s brand of nitrocellulose.
1978, Focal Encyclopedia of Photography, Desk Edition Reprint, Focal Press, London, New York