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1950 PROGRESS REPORT 527
Tests has continued its work during 1949. 8a Tests conducted by the National Archives and Record Service, co-operating with the National Bureau of Standards and the motion picture industry, have led to definite conclusions. Results of the 1948 tests led to the preparation of specifications and the manufacture of improved film storage racks of both open and closed types. Thorough tests of the new racks, with various types of water sprinkler systems, and tests with no water, have shown that the rack design is highly successful in holding the film loss to a negligible degree. This is especially true with the closed rack design. The tests also indicated that smoke detection equipment was of little value in preventing loss. Other tests conducted by this committee on the decomposition of nitrate film have shown that nitrate film in the third and fourth stages of decomposition will spontaneously ignite at temperatures as low as 120 F.
The Photo Research Corp. and the W. M. Welch Manufacturing Co. have announced photoelectric densitometers of interest. The former is intended for color use by means of filters. The Welch Densichron is notable for its accuracy and stability as a result of a-c field modulation of the cell.
Color Processes
The Ansco process has been further developed and has received additional commercial use. A complete line of film types is now available for all of the necessary steps from original taking film through the duping and special effects steps to release prints.
Du Pont has introduced a positive film for making three-color prints from separation negatives.9-10 This film is notable in that it employs a synthetic polymer which combines the functions of the gelatine and the color formerly usually employed. There has been little if any commercial use of this film.
Eastman has introduced, on an experimental basis only, a 35-mm negative-positive color process. This involves a camera negative film which yields a complementary color negative, with integral color masks, which is printed onto a color print film yielding a positive color print. The color print film may also be used with separation negatives. The color forming couplers are incorporated into the print film.
Both Eastman and Du Pont have been experimenting with a negative film which involves the use of three emulsions, two of which are