Transactions of the Society of Motion Picture Engineers (1929)

Record Details:

Title:
Transactions of the Society of Motion Picture Engineers
Date:
1929
Publisher:
New York : Society of Motion Picture Engineers
Volume:
Transactions of the Society of Motion Picture Engineers (1929)
Leaf #:
000385
Language:
English
Subjects:
motion pictures, Cinematography -- Periodicals
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Library of Congress, MBRS, Moving Image Section
Sponsor:
Library of Congress, Motion Picture, Broadcasting and Recorded Sound Division
Coordinator:
Media History Digital Library
Description:
Preceeded by an unnumbered issue published in 1916 called: Incorporation and by-laws
Date Added:
November 17, 2022
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Fixing Baths— Crahtrec and Hart 369 III. Standard Tests for Determining the Properties of Fixing Baths To date very few methods of representing the properties of a fixing bath in numerical terms have been published. The following tests, however, in no way give absolute measurements but they have proved satisfactory as a means of comparing the various formulas examined. 1. Time of Fixation. The time to clear Eastman negative motion picture panchromatic film when viewed against a black background was taken as a measure of the time of fixation. In order to maintain uniformity the film was immersed directly in the fixing bath and not previously developed in order to eliminate any error caused by swelling, which might influence the rate of diffusion of the hypo into the gelatin film and thereby affect the rate of fixation. 2. Acidity. One hundred cubic centimeter portions of the fixing bath were titrated with MQ25* developer using phenolphthalein as an indicator. The results are expressed as the number of cubic centimeters of developer required to neutralize 100 c.c. of fixing bath. 3. SiUfurization Life. The time required for the average acid fixing bath to precipitate sulfur at ordinary temperatures (65° to 70° F.) is relatively long, so that in order to increase the rate of precipitation of sulfur and reduce the time required for the experiments, samples of the fixing bath were kept in glass-stoppered bottles at 110° to 115° F. and the time noted for the first visible Elon 1.25 grams Hydroquiiioue 3.75 grams Sodium sulfite . 75.00 grams Sodium carbonate 25.00 grams Potassium bromide 1.5 grams Water to 1.5 liter turbidity. It was considered that a bath which was not stable under these conditions for one-half day was highly undesirable, whereas if the bath remained clear for three days at 110° to 115° F it was found to remain clear for about one month at normal temperatures and therefore would be quite satsfactory for use at ordinary temperatures. * Note: (Formula of MQ-25 Developer)