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coating tends to seal in the dyes in natural-color film.
Danger of first-run damage to recently processed film is virtually eliminated by lacquer coating. This is accomplished by the lubricating effect of the lacquer, which prevents chatter or strain on the perforations from emulsion gathering on the aperture or pressure plates. It is evident that by lacquer coating both sides of the film extra protection is achieved for films used in continuous projectors, and for any film likely to receive extremely hard use by extended running.
The disturbing projection quality due to noticeable flicker caused by oil mottle en the film is probably considered a more serious problem than occasional abrasions and scratches, which usually escape the observation of the average audience.
Transmission Level Improved
In coping with this problem, lacquer coating makes another distinct contribution to film protection and the requirements of quality projection. Screen flicker due to oil mottle on the film, for all practical purposes, is undetectable with lacquered films. Since the glossy lacquer coating and oil spots on the film posses similar light transmission characteristics, the screen effect of oil mottle is practically eliminated. It is the difference in the transmission properties of
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uncoated film and oil spots that aggravates screen flicker. The foregoing indicates that the glossy lacquer coating may contribute to projection quality by added brilliance to the projected image. Oil does not harm lacquer-coated film, and it can be wiped off easily without damage to the film. In similar fashion, finger prints can be cleaned easily from lacquer-coated film.
A surface coating with all the protective attributes and advantages already discussed may be presumed to be expensive in application. On the contrary, lacquer coating is so inexpensive that every film maker, film library, and distributor hardly can afford to do without it. Lecturers, particularly those who pro
ject original Kodachrome films with their talks, now are able to screen these films indefinitely when lacquer coated. In these instances, such films must be coated immediately after they have been processed and before they have been edited or screened for the first time.
Coating of both sides of such films presents an additional problem in splicing in that both the emulsion side and the base sides of the film ends must be scraped before applying cement.
Does the Coating Scratch?
The question often asked is "To what extent does such lacquer coating itself become scratched?" or "Does such coating scratch more or less readily than normal film surfaces?" Laboratory com
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Continued Prosperity!
J.E.McAULEY MFG. CD.
552-554 WEST ADAMS STREET
CHICAGO 6. ILLINOIS
16
INTERNATIONAL PROJECTIONIST • December 1950