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TINTING AND TONING MOTION PICTURE KIL.M 579
B. Sodium Sulphide (crystal) 2 lbs. 1 oz. 1000 grams
Water to _ .... . 50 gallons 200 liters
Temperature of baths: 65° to 70° F. (18° to 21° C.) Time of Bleaching: Two to four minutes. Time of Washing after Sulphiding: Ten to fifteen minutes. Life of Baths: Bath A keeps well in the dark; solution B will keep almost indefinitely.
Uranium toning is a single-solution process, and consists of:
Uranyl (Uranium) Nitrate 164 ounces 500 grams
Potassium Oxalate 1 6 4 ounces 500 grams
Potassium Ferricyanide 6Yi ounces 200 grams
Ammonium Alum l\i lbs. 1200 grams
Hydrochloric Acid (10%) sol.) 1 quart 1000 cc.
Water to 5 0 gallons 200 liters
Mix in the order given. The solution obtained should be perfectly clear and pale yellow in color.
It is convenient to keep 10% stock solutions of the above, from which a new bath may be compounded quickly when needed. A 10% solution of Hydrochloric acid is one containing 10 parts by volume of the concentrated acid in 100 volumes of the final solution.
Temperature of Toning: 65° to 70° F. (18° to 21° C.)
Time of Toning: For maximum effect, 10 minutes, during which time the tone passes through a series of changes from brown to red. By withdrawing the film at any shorter interval, any intermediate tone desired can be obtained. As this bath intensifies the image consideerably, the type of print used for theese intermediate tones should be carefully adjusted to the time of immersion in the toning bath needed to secure that tone. This chart is a safe guide to work from:
NATURE OF PRINT TIME OF TONING COLOR
Normal 2 Minutes Chocolate
Medium 5 minutes Warm Brown
Thin 10 minutes Reddish Brown
Time of Washing: Ten to fifteen minutes. In this time the highlights will become clear, though a thin yellowish-brownish veil may remain in the clear gelatin as a result of the intensification of minute traces of fog: this has no effect on projection. Washing should not be prolonged, especially if the water is inclined to be alkaline, as the toned image is soluble in alkali.
Life of Bath: Fifty gallons will tone about 5,000 feet of film, after which the rich tone tends to flatness. At this point the bath may be revived by adding acid to the extent of the original amount, after which a further 5,000 feet of film may be toned. After this stage the bath becomes exhausted rapidly, and should be thrown away.
Iron Tone (Blue) :
Ammonium Persulphate 3 '/£ ounces 100 grams
Ferric Alum (ferric Ammonium Sulphate) 8'/4 ounces 250 grams
Oxalic Acid 1 !4 lbs. 600 grams
Potassium Ferricyanide 6]/z ounces 200 grams
Ammonium Alum 2 lbs. 1 ounce 1000 grams
Hydrochloric Acid (10% sol.) .... 6V2 ounces 200 cc.
Water to 5 0 gallons 200 liters