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Nov., 1932] TREATMENT OF NEW FILM 423
It is highly desirable that film be treated by the laboratories in such a manner that the following objectives may be achieved :
(1) The film should be able to make its first passage through the projector with the facility and ease of a seasoned film, thereby eliminating the danger of pulling or tearing the perforations.
(2) The gelatin should be chemically cured, so as to be protected against the scratching of the surface that occurs with practically all film during its first few screenings, unless so treated.
(3) The buckling, warping, or curling of the film incident to its being heated by the projection lamp should be reduced to a minimum.
(4) The pliability of the gelatin and its binder should be as permanent as possible, thus assuring a longer and hardier life of the film.
Any treatment of film that is not satisfactory in these respects is inadequate and of little importance in its application to film. Any process of treatment for new film, other than that of aging during the use of the film in projection, must be either a surfacing or an impregnating process; surfacing processes consist in altering the existing surface, as by buffing, or in applying a new surface, as by coating. Coatings that are not made a permanent part of the film itself, and, as a result, may be left in the projector in the form of deposits, are, according to the size of the deposits, menaces to the correct reproduction of sound. Buffing will help new film to pass through a projector freely, but it can not offer definite assurance that the picture image or sound track will not be affected by alterations in the buffing surface, caused by the attachment of gelatin to it. Measurements made in ground noise tests readily prove this. Impregnation processes must refrain from using agencies that shorten the life of either the gelatin or the base, and must not alter the pliability of either of these.
Those who have been engaged in the endeavor to maintain prints in a satisfactory condition up to the time of the final booking date realize that it is now possible to achieve such a result, and that some of the major distributors are now preparing and maintaining their product so as to take advantage of this situation.