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FOR MANAGERS AND OPERATORS 99 WET FILM. Should you by accident get the film wet, no matter how wet, it will receive no material damage if you immediately unroll it and stretch it in such manner that the emulsion touches nothing until it is dry. This does not apply to col- ored or tinted film, though even this may sometimes be saved by prompt action. But the unrolling must be done very quickly. REMOVING EMULSION—MOISTENING DRY FILM. When it is desired for any reason to remove the emulsion from film it may be done by soaking in warm water to which has been added sal soda (common washing soda will do). Use plenty of the soda and let the film soak for say 15 min- utes, and you can then wash the emulsion off easily. It may also be removed by soaking in ordinary cold water and then scraping. Proceed as follows: Soak the film until emulsion is soft. Lay film, emulsion side up, on a flat board or table and draw it under the blade of a knife. If the knife blade is long enough and the edge straight enough the whole sur- face of the film will be cleaned at one wipe. Film should, so far as possible, be kept in a cool, moist place, though the matter of moisture may be overdone. If you get too much of it the emulsion will stick to the back of the film. It is a mere waste of space telling operators not to keep spare film near the ceiling of a hot operating room. They will keep it where it is most convenient. However, films not on the machine should be kept in a solderless metal box or cabinet located near the floor, and if fastened to the wall it should be so attached that it may be instantly lifted away and car- ried outside in case of fire. Where a film tank is used it is well to have the bottom covered with a coarse screen held an inch from the bottom by wooden or metal cleats. In the bottom of the tank keep some water to which has been added just a little glycerine—one part of glycerine to 33 of water is about right. This will be very beneficial to the films. Old, brittle film may be made pliable as follows: Get any metal can large enough to hold a film when unrolled loosely. The can must have a tight cover. Cover the bottom with a coarse screen, leavino^ an inch or two below it. Into this space place a mixture of water and glycerine as above. Unroll the