Cinematographic annual : 1930 (1930)

Record Details:

Title:
Cinematographic annual : 1930
Date:
1930
Publisher:
Hollywood : The American Society of Cinematographers, Inc.
Volume:
Cinematographic annual : 1930
Leaf #:
000156
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
{"Media History Digital Library","Richard Koszarski","Jeff Joseph"}
Coordinator:
Media History Digital Library
Description:
Date Added:
March 21, 2024
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138 CINEMATOGRAPHIC ANNUAL 7 shows the results of an exhaustion test with this developer. It will be noted that after 400 ft. per gallon had been developed, 12 min. in the old developer and 8 min. in the fresh developer produced a density of approximately 1 for equal exposures. This longer development, however, gives pictures with slightly less shadow detail than the shorter development time gives in the fresh developer. The alkalinity of the developer under observation remained practically constant, showing that the necessary increase in developing time comes as a result of the reduction of concentration of reducer and the accumulation of bromide and reaction products in the developer rather than to alkalinity decrease. The practice of renewing a borax developing bath with additions of borax serves to bring the rate of development back to the original figure but can not bring the detail giving power which has been lost through the progressive bromide accumulations. The permissible tolerance will vary somewhat with the class of work, and will determine the "life" of the developer.