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MANAGERS AND PROJECTIONISTS 291
with commercially pure tetrachloride without damage, provided the same be allowed to thoroughly evaporate before rewinding the film. To do this it is necessary to wind the film spirally on a drying drum, which must be about six feet in diameter by six or seven feet long for a thousand feet of film. The drum should be revolved until the film is thoroughly dry.
WARNING— If the film be cleaned by being pulled through a cloth moistened with tetrachloride, and be immediately rewound, sufficient of the fluid may, and probably will remain to attack and seriously injure the film image by bleaching it out.
Film may be cleaned with gasoline, benzine, toluene or zylene, but all these are inflammable.
The Eastman Company says : "The solvent tetrachlorethylene, made and sold by the Dow Chemical Company, Midland, Michigan, is non-inflammable and can be recommended for film cleaning. This substance does not attack the film, and is sufficiently non-volatile to remain for a short time before evaporating, and so has a chance to dissolve out the grease from the film before it is wiped off."
After using this solvent, however, the Eastman Company recommends that, as a precaution, the film be wound on a drying drum, as above described.
There is at least one firm in New York City which makes a business of cleaning film. Its process is quite thorough. The projectionist who wishes to use the cotton pad method can easily construct a device to hold two canton flannel pads, each about six inches long, together under some pressure, between which the film may be drawn in the process of rewinding. We do not especially recommend it, but it can be done. The pad should consist of at least four or five thicknesses of cloth — the more the better. It is even possible for the projectionist to remove considerable dirt and oil by pulling the film between absorbent cotton cloths held in his hands in the process of rewinding. As we said in the first place, however, the cleaning of film is a legitimate function of the exchange, and we recommend that the projectionist confine his efforts to careful handling of the film, to the end that no oil and as little dirt as possible be accumulated thereon while it is in his possession.
CLEANING PROJECTOR AFTER A FILM FIRE.— Burning film leaves a sticky, brown, gummy substance on metal. This may be easily dissolved and removed by washing the