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I think you’re thinking of Celluloid. That’s what the old movies used. 🙂
From Kodak;

Cellulose acetate is used as a film base, a transparent substrate that supports photosensitive emulsion (silver halide colloidal particles in gelatin mix) that sits on top of it.
 
Ah! I stand corrected! Sorry about that @Cindy027! Celluloid was also used, but it is not the same as Cellulose Acetate.
From Wikipedia (for anyone interested)

Most movie and photography films prior to the widespread move to acetate films in the 1950s were made of celluloid. Its high flammability was legendary since it self-ignites when exposed to temperatures over 150 °C in front of a hot movie-projector beam. While celluloid film was standard for 35mm theatrical productions until around 1950, motion-picture film for amateur use, such as 16mm and 8mm film, were on acetate "safety base", at least in the US.
 
Ah! I stand corrected! Sorry about that @Cindy027! Celluloid was also used, but it is not the same as Cellulose Acetate.
Celluloid was what was used in the beginning of film production but it was highly inflammable so they changed sometime. The only reason I know this is because when I was still at school I had an unhealthy fascination with photography and delved into all the different film emulsions and manufacturers.
 
Celluloid was what was used in the beginning of film production but it was highly inflammable so they changed sometime. The only reason I know this is because when I was still at school I had an unhealthy fascination with photography and delved into all the different film emulsions and manufacturers.
There is certainly nothing unhealthy about that fascination!! 😁
 
From Wikipedia (for anyone interested)

Most movie and photography films prior to the widespread move to acetate films in the 1950s were made of celluloid. Its high flammability was legendary since it self-ignites when exposed to temperatures over 150 °C in front of a hot movie-projector beam. While celluloid film was standard for 35mm theatrical productions until around 1950, motion-picture film for amateur use, such as 16mm and 8mm film, were on acetate "safety base", at least in the US.
That's also a factor in their degradation in less than ideal conditions. I think something like 80% of all films made prior to 1950 are believed lost.

Celluloid was what was used in the beginning of film production but it was highly inflammable so they changed sometime. The only reason I know this is because when I was still at school I had an unhealthy fascination with photography and delved into all the different film emulsions and manufacturers.
When I was studying preservation, I learned about photos and the "vinegar syndrome" names for the smell of degrading photos processed with certain film stock. It's a smell you never forget. Ewwwwwwww!!
 
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