Journal of the Society of Motion Picture Engineers (1930-1949)

Record Details:

Title:
Journal of the Society of Motion Picture Engineers
Date:
1930-1949
Publisher:
New York, N.Y. : The Society
Volume:
Journal of the Society of Motion Picture Engineers
Leaf #:
00034
Language:
English
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Prelinger Library
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
The Journal of the Society of Motion Picture Engineers (SMPE)Êdocuments the technological progress of the film industry, highlighting technical developments in production and exhibition. Of special interest are articles about special effects, theater practices, lighting, and the introduction of the 16mm format. Initially titled "Transactions of the Journal of the Society of Motion Picture Engineers."Digitized by the Prelinger Library and the Library of Congress Motion Picture, Broadcasting and Recorded Sound Division.
Date Added:
July 19, 2022
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1949 COLOR FILM DEVELOPERS AND BLEACH 31 approached. With eerie sulfate equilibrium is reached more rapidly and the length of time required for the titration is thus shortened. It is necessary that the sample be diluted as described since the position and magnitude of the inflection is influenced by the salt content of the solution (Fig. 2). The eerie sulfate method gave an accuracy of 99.5 =*=0.5 per cent in the range of 2.5 to 10.0 grams of ferrocyanide ion per liter. PROCEDURES Determination of Metol and Hydroquinone A. Metol — Pipet a 25.0-milliliter sample of developer into a 125milliliter separatory funnel. Add 2 drops of thymol blue indicator 700 600 SAMPLE DILUTED l-l , INFLECTION AT 6.09ML. X SAMPLE DILUTED 1-4.6 INFLECTION AT 8.21 ML. CALC. ENDPOINT 8.2 4 ML. ML. O.IN CERIC SULFATE Fig. 2 — Effect of dilution on titration of ferrocyanide in bleach. and one-to-one sulfuric acid until the color of the solution just turns yellow (pH 8 to 8.5). Add 12 grams potassium bromide, 25 milliliters of iso-propyl acetate, shake for 3 minutes and then allow the layers to separate completely. Drain the aqueous layer into a 50milliliter beaker, allowing a small amount of solvent to enter the stopcock bore. Pour the solvent into a small dry beaker. Return the aqueous portion to the funnel, rinse the beaker with an additional 25 milliliters of solvent and add this to the funnel. Repeat the shaking and separation. Pour the first solvent extract, containing most of the extracted