The next most important thing to do is to wash the print free from developer before putting it in the hypo. If the print is allowed to remain in a large quantity of clean water for two or three minutes after developing and before fixing, there is no excess of developer to discolor the hypo or the print. Of eourse, to obtain this result it is necessary to properly expose the picture. If it is over-exposed, it will be necessary to hurry it from the developer into the hypo and give it only a hasty rinse. If, then, it is not properly immersed at once in the fixing bath, the developer will be oxidized rapidly in the thin film of liquid caught between the print and the air, and the result will be a patch of brown decomposition products which will ruin the print

Even if the individual prints are not stained, the result of introducing developer into the hypo with each of them is to discolor it to an extent which may finally cause deterioration of the purity of the whites of the paper. In order to insure the permanency of the prints, it is necessary to wash them well. The fixing should last at least ten minutes, the prints being kept well separated during this time. The washing should last at least half an hour in running water, with current enough to keep the prints moving and well separated. If this is not practicable, the prints may be washed by passing through twelve changes of water, leaving in each about five minutes. The process may be shortened by piling up the prints and squeezing out the water each time they are changed from one wash to the next. In this way the water is removed as completely as possible each time, and diffusion can take place more rapidly in the next water.