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.
Prints dry a trifle darker than they appear when wet.
554. Manipulating Results by Means of the Restrain-er (No. 3). - It will be found that the more restrainer added to the developer the greater will be the amount of exposure necessary when printing. By applying this to an underdeveloped, over-exposed negative - in other words, a very flat negative - the printing should be carried to a considerable depth, and by using from two to four times the amount of restrainer called for when developing a print from a normal negative, a sufficient amount of contrast will result. If judgment is exercised it will be found that this restrainer places in your hands a great power with which to manipulate.
555. This process is not generally used in photographic studios, yet is employed by a great many commercial and landscape photographers, as the process is inexpensive. The principal advantage of the process lies in the fact that the printing can be done on almost any kind of material. The sensitizing, printing and developing is all done on short order and some very pretty effects can be produced. You must familiarize yourself with the process to appreciate its good qualities. Select for your initial work some ordinary drawing paper and sensitize it first without sizing, making several experiments in this way. After you have become quite familiar with the process, select coarser paper requiring sizing, and size and sensitize according to instructions, making several prints thereon.
556. A good plan is to size and sensitize a number of different grades and weights of paper. Pulpy paper should not be used for this purpose, as you are apt to be troubled with air bubbles. However, this material may be used if carefully sized before sensitizing, to give the surface a good body. After making prints on all the different surfaces, you will have a pretty fair idea of the process. By noting on the backs of your test prints your observations of the effects of the different manipulations, making particular note of the various qualities of paper which produced the best results, filing all these prints in your proof file, you will establish a record of valuable information for future reference.