The book Instruction in Photography was written by author William De Wiveleslie Abney Here you can read free online of Instruction in Photography book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Instruction in Photography a good or bad book?
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It is now ready for printing, though a backing (see page 266) may be given it. When in contact with the negative it must be exposed for about fifteen seconds to the diffused light of a clear sky, or longer if the day be overcast. To develop it, the following solutions should be prepared : A. Pyrogallic acid 60 grains Acetic acid ... ... ... ... 3 ounces Citric acid ... ... ... ... 15 grains Water ... ... ... ... 1 ounce B. Silver nitrate ... ... ... ... 30 grains Water (distilled) ... ... ... 1... ounce DETAILS OF THE ALBUMEN PROCESS 315 After removing the backing, wash the plate under the tap, and flow over it solution A and return it into the cup, in which have been dropped three or four drops of B. It is well to warm the developing solutions up to about 1 20 F. , as then the image will begin to appear rapidly and evenly. In about twenty seconds the shadows should show, and it should be fully developed in three or four minutes. When any signs of streaks are visible, the plate should be washed and the cotton- wool tuft applied, after which the developing solution may again be flowed over the plate.
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