Heard from Dudya in his latest film that photo and cine film are made from cows. Googled it. 70 percent of the film is photographic gelatin. No substitute. The link has a very useful image about other uses for cows.
https://petapixel.com/2011/11/15/did-you-know-film-and-photo-paper-are-made-using-animals-parts/
Hi, I'm Rauf Aliev. 