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REPORT OF THE COMMITTEE ON FILMS AND EMULSIONS
Emulsions
NO EMULSIONS having properties essentially different from those now existing have appeared.
Manufacturers are making every effect to increase the speed of their negative panchromatic emulsion. Emulsions during the past year have been far superior to those of any previous year.
Wear and Tear on Life of Film
Manufacturers are making every effort to produce film having better wearing qualities. Short life of film is a result either of absence of moisture in the film or of maltreatment, either chemical or mechanical. The moisture content of film should be such as exists when film is in equilibrium with an atmosphere of 70% relative humidity. Treatment of the film with glycerine in the laboratory is a great help in keeping the film moist.
Mechanical maltreatment is usually of the nature of corner fractures of the sprocket holes. If the corner of a sprocket hole becomes fractured or torn, if even very slightly, the strength of the film is very much weakened and the life is shortened in due proportion. This maltreatment often occurs during printing as a result of non-alignment of sprockets, imperfect or rough sprocket teeth, or incorrect timing of the printer. Ultra-rapid projection in the inspection room of the laboratory invariably results in corner fractures.
It is the duty of every laboratory to carefully inspect the perforations of the film, if necessary under a microscope, in order to ensure that the perforations are perfect before the film leaves the laboratory.
Desensitizing
A great deal of research work has been done in connection with emulsion desensitizers. These chemicals have the property of diminishing the sensitiveness of any emulsion after exposure without destroying the latent image.
Phenosaf ranine was the first desensitizer which came into prominence but this has the disadvantage that it stains the emulsion and it is almost impossible to remove this stain.
Recently the desensitizer Pinakryptol Green has been put on the market and this is quite as effective as Phenosafranine and does not stain the emulsion. Investigation indicates that this material shows promises for use in developing motion picture film. With an MQ developer, adding 1 part of Pinakryptol Green per 25,000 parts of developer, after development has proceeded for 1 minute it is possible to inspect negative film with a Series 00 safelight. The film may be
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