This section is from the book "Complete Self-Instructing Library Of Practical Photography", by J. B. Schriever. Also available from Amazon: Complete Self-Instructing Library Of Practical Photography.
Depth Of Printing. You will find that while this paper prints fairly rapidly, it is best to make your prints in strong sunlight. The paper is placed in position on the negative in the ordinary way, the yellow side coming in contact with the film of the negative. When the shadows take on an olive green appearance, a bronzing as it were, the image is printed dark enough. A little experimenting will soon teach you the proper depth of printing.
Developing. Place in a clean tray sufficient water to almost fill it. Place your prints into this clean water, allowing them to remain for a few minutes. Then give them a number of changes until the last water shows no discoloration; about 15 minutes of washing will be sufficient. If the water is hard, it is advisable to add a little hydrochloric acid to the wash waters. The prints may also be developed by holding directly under a tap and allowing the water to run on them until the draining exhausts the coloring, when the prints will be developed. It is not advisable to wash the prints longer than is absolutely necessary, as long washing is apt to cause them to become flat and lose all brilliancy.
Drying Prints. Place your prints face down on a clean white, chemically pure, photographic blotter. Place another blotter over the prints, then rub your hand or roller over this blotter, so as to absorb the excessive moisture in the prints. Next place your prints between two perfectly dry blotters and allow them to remain until dry.
Toning Blue Prints. For those who care to tone their prints the following formula will enable them to produce excellent black tones. After the print has been developed and washed, place it for a few minutes in a bath of water, which has been made slightly acid by adding a few drops of nitric acid. After this bath immerse the prints in the following solution:
Carbonate of Soda...............
360. Allow them to remain until the image disappears and reappears again with an orange tone. They should then be placed in the following bath:
Leave the print in this bath until the desired tone is obtained, which usually requires from eight to ten minutes.
Converting Blue Prints Into Brown Prints. If you have blue prints which you desire to convert into a brown tone, the following method will be found very satisfactory. The blue prints should be thoroughly washed and dried, and then quickly plunged into the following solution:
362. Leave the print in this solution until it has nearly lost all of its color, which will take from two to four minutes. Rinse the print and again plunge it into a bath of tannic acid prepared as follows:
363. Leave the print in this bath until the desired clearness and tone are obtained, which will usually require about ten minutes. When the color is not dark enough it may be intensified by adding to this bath a few drops of ammonia. After a couple of minutes rinse the print thoroughly in water, and dry.