This paper may be prepared by the amateur, but the ready-prepared papers are so reliable and so inexpensive, that it is really cheaper to buy the paper already sensitized. One great advantage of bromide paper over printing-out paper is that in using it one is entirely independent of day or sunlight. Strong "plucky" negatives are the best for bromide printing, but very good prints may be made with weak negatives by carefully timing the printing. All the process of working bromide paper, except that of the printing, must be conducted by a red or yellow light. Open the package of paper in the dark-room, and the negative being already in the printing-frame, adjust a sheet of paper over the negative. The face of bromide paper may always be distinguished by its _curling in_. Cover the frame with a dark cloth, open the door of the lantern, and get your timepiece ready, for one must always print by exact seconds; never guess at the time. Uncover the frame and hold the negative about fifteen inches from the flame of the lamp, and if the negative is an ordinary printing one, expose to the light for ten seconds. Cover the frame immediately, close the door of the lantern, take the print from the frame, and if you wish to develop it at once soak the paper in clear water till it is limp enough to lie flat. Place it in the developing-tray face up, and flood it with developer. One may use almost any kind of developer with bromide paper. Eikonogen and hydrochinon are good developers, and do not stain the hands; but ferrous oxalate is the developer most used. The image on the paper should develop rather slowly, and come up clear and brilliant. Develop till the detail is well out and the shadows deep enough. Pour off all the developer, leaving the print in the tray, and cover it with a solution composed of 1 dr. acetic acid, and 32 oz. of water. Allow this to act one minute; turn off, and repeat the operation twice more. Wash the print thoroughly, and place in a fixing bath of hypo, 3 oz.; water, 16 oz. After fixing, wash for an hour in running water, and hang up to dry. If prints are washed in running water they should be taken from the bowl two or three times during the washing, and the bowl filled with clean water. If running water is not used wash in ten changes of water, allowing the prints to remain ten minutes in each change of water. In bromide prints one must be very careful to have all dishes used in the operation strictly clean. Greenish tones in the prints are caused by over-exposure and too much bromide in the developing solution. Yellow prints are caused by under-exposure, and too long development. In developing rock the tray in all directions. If it is rocked in one direction only, the prints will be streaked. Do not let water run directly on the prints, as it will cause blisters.