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.
Stopping Action Of Developer. When developing with Metol-Hydroquinon developer, the development can be stopped instantly by immersing the print in a salt bath made up as follows: One ounce of salt to 10 ounces of water.
Drying Bromide. Never dry bromide prints between blotting papers.
Washing. Prints should be thoroughly washed in 30 minutes, using running water or giving the prints frequent changes.
Fixing And Washing. It is better to thoroughly fix and wash little than to prolong the washing and not fix properly.
Life Of Developer. The same developer can be used for a number of prints in succession, but should be thrown away when it becomes slow in action. Unless you do this the resulting tones on the prints will be poor.
Cracked Trays. Cracked, or rough surfaced developing trays will cause marks and lines on the prints.
Prints Sticking Together. Prints should never be allowed to stick together in the fixing bath, as that is apt to cause stains.
Stains From Old Developer. Developer which is old or used too often will cause stains.
Cleanliness. By observing absolute cleanliness throughout the entire manipulation you will avoid stains.
Master One Brand Of Paper. Use one brand of paper; stick to it; learn to understand it.
Trial Exposures. Making trial exposures on slips of paper will pay you in the long run.
Agitate Developer. Keep the developer agitated by rocking the developing tray, but never rock in one direction only.
White Light. Never expose the prints to any light except that of the dark-room until they are thoroughly fixed.
Stains On Edges Of Print. Stains on the edges of prints are sometimes due to old paper, but more often they are caused by paper coming in contact with the edge of the hypo tray before it is fixed.