Cellulose acetate, which replaced cellulose nitrate, is fire resistant and not brittle, so it doesn't need a plasticizer.
22.
Until about 1950, all motion pictures were shot and projected with film stock that used a cellulose nitrate base.
23.
Prior to cellulose nitrate ( i . e . : guncotton ), which yellowed quickly and was extremely flammable.
24.
According to the producers the film had a length of around 600 metres, on 35 mm cellulose nitrate film.
25.
Old film stock was composed of silver cellulose nitrate, a substance that put the " silver " luminousness onto the silver screen.
26.
The cellulose nitrate in dice can, after many years, begin to crystallize and crack and literally implode, making the most marvelous shapes.
27.
In the early days of film, when the stock was made of cellulose nitrate, studios sometimes burned old films for special effects.
28.
"' Photographic emulsion "'is a light-sensitive colloid used in glass, films ( of cellulose nitrate, cellulose acetate or polyester ), paper, or fabric.
29.
The chemical instability of cellulose nitrate material, unrecognized at the time of its introduction, has since become a major threat for film collections.
30.
"Cellulose nitrate is easily ignited, burns with intense heat, and emits gases that are poisonous and flammable, " one of the citations said.
