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All That Flickers Isn't Gold!
Tons of pure silver are used each wee\ in the manufacture of photoplay film
By courtesy of the Eastman Kodak Company
We all realize the tremendous task of producing a movie; we know of the scenario work — the selecting of players and even of the important processes of developing. But few of us understand the process of manufacturing the film itself. Maybe you didn't know that the film is made largely of silver — pure silver, and cotton — ordinary plantation variety cotton. The Eastman people use over two tons of silver a week in the manufacture of film. The picture above shows the weighing of the white metal. Each bar tips the scales at about forty -two pounds.
Cotton, carefully cleaned, is mixed with nitric and sulphuric acids. After immersion the nitrated cotton is put into centrifugal vats of organic solvents, changing the cotton to a honey-like liquid called "dope." This is poured over a smooth surface and when hardened constitutes the film body. On this is spread the sensitive coating. The film is then cut into regulation strips, carefully inspected, and is then ready for the camera.
After the weighing process the silver is taken to the nitrating department and put into bowls of dilute nitric acid. (As shown above). By evaporation, silver nitrate crystals are formed, shown in the white basket at left, in which there are iooo ounces. These crystals are mixed with a solution of potassium bromide and dissolved gelatin, forming the lightsensitive coating. The emulsion used for motion picture film is more sensitive than that for the ordinary kodak film as the periodof exposure is briefer.
This illustrates how the film -making industry has grown since the inception of the motion picture. The small, inscribed barrel served adequately when the ordinary kodak film was the sole output. But today — when scores of studios arc calling for thousands of feet of film — well, the row of big barrels, used in mixing the dope, hardly suffices.
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