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CHAPTER VI CARE OF FILM HE j lovie maker should never allow film to remain uncovered for any length of time. The proper place for a reel of film is in the humidor can which fits neatly over the reel and contains a blotter or other device for keep- ing the film in a moist and pliable condition. When the film is exposed to air and warm temperature, it dries out quickly. In addition to a slight shrinkage, it be- comes brittle and there is a tendency for splices to pull apart when run through the projector. Film humidors should be moistened about once every two months, even if the film has not been used during that time. All film should be cleaned after it has been run through the projector a dozen times. In passing through the gate, the film picks up particles of dirt and grit. Fingers also leave their oily deposits on the emulsion when handled during re- winding. All these smears cut down light which passes through the film during projection. If you would have crystal clear pic- tures on your screen, you will be well repaid for the time it takes to clean the film. There are several film cleaning liquids on the market, but some of them are rather expensive. All non-inflammable film cleaning liquids use carbon tetrachloride as a basic ingredient, because it dries instantly, does not shrink the film, nor mar it in any way. Several of these liquids are put up for cleaning dresses, gloves and other articles, under different trade names. But you can buy a quart of carbon tetrachloride from your drug- gist or chemical supply house for a very small sum. PROTECTING FILM—In cleaning film, use a cloth that will not scratch the sensitive emulsion. Odd pieces of velvet are ideal for the purpose. Saturate a small piece of cloth with 33