Question

Which is used in motion picture films
A.cellulose acetate
B.Glucose acetate
C.Starch acetate
D.Sucrose acetate

Answer 1

Hint: Film stock is an analogue recording media for motion movies and animation. A movie camera captures the footage, which is then processed, processed, and projected onto a screen using a movie projector. It's a translucent plastic film strip or sheet with a gelatin emulsion on one side that contains microscopically minuscule light-sensitive silver halide crystals. The sensitivity, contrast, and resolution of the film are determined by the sizes and other features of the crystals.

Complete answer: In photography, cellulose acetate film, often known as safety film, is used as a basis material for photographic emulsions. It was first offered by film makers in the early twentieth century as a safe film base substitute for unstable and extremely flammable nitrate film. The German chemists Arthur Eichengrün and Theodore Becker invented the cellulose diacetate film, which they patented under the name Cellit, in 1901, using a process they devised for the direct acetylation of cellulose at a low temperature to prevent degradation, which allowed the degree of acetylation to be controlled, avoiding total conversion to its triacetate.
Cellit was a cellulose acetate polymer that could be dissolved in acetone for further processing and was stable and non-brittle. In 1904, American scientist George Miles produced a cellulose diacetate film that was more easily dissolved in acetone. Eastman Kodak and the Pathé Fréres commercialised Miles' technique (partially hydrolyzing the polymer) for photographic film in 1909. This breakthrough began with cellulose diacetate in the 1930s, followed by cellulose acetate propionate and cellulose acetate butyrate in the 1940s, and lastly, cellulose triacetate in the late 1940s, along with polyester bases. Safety film was the name given to these less flammable alternatives to nitrate film.
A transparent plastic foundation is covered with a tiny coating of gelatin to make motion picture film. This layer contains a picture created using colour dyes or, in the case of black-and-white film, extremely minute silver particles.
Since the 1950s, cellulose acetate has been utilised as a safety film foundation. The words "safety film" placed on the film edge help to identify it.
Hence option A is correct.

Note:
With increased acid exposure, A-D, or "acid-detection" indicator strips produced by the Image Permanence Institute change colour from blue through shades of green to yellow. They were, according to the test User's Guide, "It was intended to help in the preservation of photographic film collections, such as sheet and roll films, cinema film, and microfilm. They offer a non-destructive way to assess the severity of vinegar syndrome in film collections." These tools may be used to figure out how much damage a film collection has and what efforts should be done to keep it usable.