The sciopticon manual, explaining lantern projection in general, and the sciopticon apparatus in paricular (1877)

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70 SCIOPTICON MANUAL. ALKALINE SOLUTIONS. Carbonate of Ammonia, 64 grains. "Water, 1 ounce. Bromide of Potassium, 4 grains. "Water, 1 ounce. Mix together. After the plate is well washed, flow over it a solu- tion of Pyrogallic Acid, 2 grains. Water, 1 ounce. Then pour back again into the measure. Should the image be developed by this solution, proceed very cau- tiously, and add a few drops of the alkaline solution of carbonate of ammonia and bromide of potassium. If the picture comes out slowly, add more of the alkaline solution up to thirty drops, if necessary, and also a suf- ficient amount of stronger pyro to bring out all the detail. When the image is out, wash with water, and intensify with Pyrogallic Acid, 2 grains. Water, 1 ounce. To which is added ten drops of citric acid and nitrate of silver solution. Citric Acid, 30 grains. Nitrate of Silver, 20 " Water, 1 ounce. This is a stock-bottle. Mix in separate glasses; add together and filter; wash. FIXING SOLUTION. Hyposulphite of soda. TONING SOLUTION. The same remarks applied to wet positives will answer for toning dry plates.