Cinematographic annual : 1931 (1931)

Record Details:

Title:
Cinematographic annual : 1931
Date:
1931
Publisher:
Hollywood : The American Society of Cinematographers, Inc.
Volume:
Cinematographic annual : 1931
Leaf #:
000483
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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USEFUL FACTS AND FORMULAE 387 MOTION PICTURE FIXING BATH Avoirdupois Metric Water ~.. 1 gallon 4.0 liters Hypo 2 pounds 9 60.0 grams When thoroughly dissolved, add the following cool hardener solution slowly stirring to the cool hypo solution. Avoirdupois Metric Water .... 4 ounces 128.0 cc. Sodium sulphite (E. K. Co.) 175 grains 1 2.0 grams •Acetic acid (28% pure) (E. K. Co.) 2 \i ounces 72.0 cc. Powdered potassium alum 3 50 grains 24.0 grams *To make 28% acetic acid from glacial acetic acid, dilute throe parts of glacial acid with eight parti of water. To make up the hardener dissolve the chemicals in the order given above. The sodium sulphite should be dissolved completely before adding the acetic acid. After the sulphite acid solution has been mixed thoroughly, add the potassium alum with constant stirring. If the hypo is not thoroughly dissolved before adding the hardener a precipitate of sulphur is likely to form. FINE GRAIN NEGATIVE DEVELOPER For Motion Pictures (Eton Hydroquinone -Borax) Avoirdupois Metric Elon _ 1 1 5 grains 8.0 grams Sodium sulphite (E. K. Co.) 1 3 J4 ounces 400.0 grams Hydroquinone 290 grains 20.0 grams Borax 115 grains 8.0 grams Water to make _ 1 gallon 4.0 liters Directions for Mixing: Dissolve the elon in a small volume of water (at about 125° F) (5 2° C.) and add the solution to the tank. Then dissolve approximately one-quarter of the sulphite separately in hot water (at about 160° F.) (71° C), add the hydroquinone with stirring until completely dissolved. Then add this solution to the tank. Now dissolve the remainder of the sulphite in hot water (about 160° F.) (7 1° C), add the borax and when dissolved, pour the entire solution into the tank. Dilute to the required volume with cold water. Time of development is 10 to 20 minutes at 65° F. (18° C.) NEGATIVE MOTION PICTURE DEVELOPER (Elon -Hydroquinone) Avoirdupois Metric Elon ... 115 grains 8.0 grams Sodium sulphite (E. K. Co.) 2Vi ounces 75.0 grams Hydroquinone 29 grains 2.0 grams Sodium carbonate (E. K. Co.) ..'. \)^ ounces 50.0 grams Potassium bromide 43 grains 3.0 grams Water to make _ 1 gallon 4.0 liters Time of development 6 to 1 2 minutes at 65° F. (18° C ) MOTION PICTURE DEVELOPER Negative or Positive GLYCIN CHubl's Formula) STOCK SOLUTION Hot Water 1 gallon Sodium Sulphite . 5 lbs. DISSOLVE AND ADD: Glycin __ 2 lbs. DISSOLVE AND ADD SLOWLY: Potassium Carbonate 10 lbs. For Use: AS A NEGATIVE DEVELOPER: Use 1 part of the Stock Solution to 60 of water. AS A POSITIVE DEVELOPER: Use 1 part of the Stock Solution to 1 5 or 30 of water.