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 #:
000154
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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136 CINEMATOGRAPHIC ANNUAL hydroquinone. The tests showed a tendency for fog to increase more than in proportion to the additional development produced by the increase of hydroquinone. The net result was that cleaner, more satisfactory development was obtained by increasing the time some twenty percent with metol only as a reducer. The degree of increase of fog with hydroquinone differed somewhat between emulsions, and in many cases was serious. Fig. 4. Eight minute developments with: Sodium sulfite, 75 g/1; metol, varied; borax, 5 g /l ; hydroquinone, varied. Emul. 2568. Curve No. Metol Hydroquinone Fog 1 0 20 .07 2 2.5 0 .07 3 2.5 5 .08 4 2.5 10 .10 Fig. 5. Eight minute developments with : Sodium sulfite, 75 g/1; metol, varied; borax 5 g/1. Emul. 2568. Curve No. Metol PH Foe 1 2.5 9.0 .07 2 5 8.6 .06 3 10 8.2 .07 With metol alone as a reducer, the image density for fixed time of development does not increase indefinitely. Fig. 5 shows a series of curves with increasing metol concentration. It is to be noted that the alkalinity of the developer, pH, decreases due to the addition of the metol, which is sold commercially as a sulfate and hydrolyzes liberating acid in the developer, making the solution less alkaline.