Plastic Used in Film Strips
This page is the CodyCross answer for the clue below from Photography, Group 2017, Puzzle 5 (Diane Arbus).
Question is: Plastic Used in Film Strips
and the answer is: CELLULOID
Word Meaning:
CELLULOID — Any of a variety of thermoplastics created from nitrocellulose and camphor, once used as photographic film.
Definitions from Wiktionary.