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• This is how processed movie film looks after undergoing first develop « Here is the same film viewed from the back. Values are reversed,
ment, when viewed from the front or emulsion side. Image is quite dark i.e., all light areas in the original scene are rendered dark, and vice
and appears to have an over-all fog. versa. This is approximate appearance of film correctly developed.
Filin Processing For The Beginner
Once You've Tried It You'll Want To Process All Your Films For The Sheer Enjoyment Of It
THE THING that has always made still photography so popular with amateurs is the ease with which they can develop and print their own pictures. The movie amateur can enjoy a similar phase in his hobby by reversing his own films, providing he shoots black and white. And today, with color film still hard to get, there is increasing use of black and white movie film.
The fascinating thing about processing your own movie film is that you can screen your pictures the same day you shoot them, if necessary. The processing job is less than an hour's work, providing you have adequate equipment.
Reversal processing of movie film is entirely different from the development and printing of snapshot negatives. With reversal movie film the one film must supply both the negative and the positive images.
In the reversal process the film is first developed in a rather vigorous developer. This produces a negative image. Here the similarity with ordinary film developing ends. After the film image has been developed to a negative it is then given a short wash and bleached.
The bleach solution dissolves all the developed silver in the negative image. If, for example, we photograph a white
By WILLIAM
BLACK CAR>D
GREY CAdD
WHITE CAKD
F
rst Development
Bleaching
Second Development
• The result of the processing action on different exposure values is demonstrated above. Note that exposure to the black card made no material difference in the emulsion while the grey and white cards so affected the emulsion that the silver was removed in comparable degrees in the developing process. Thus the lighter areas of the picture become correspondingly lighter on the film because more of the silver salts are eliminated in those areas by the developer.
I . B 0 R N M A N
card, it would naturally show black on the negative. After bleaching, however, it will show as clear film since all the black silver will be dissolved. Conversely a black card would not show any development on the negative and after bleaching this area would consist of undeveloped silver. Following the bleach the film is washed and put through the clearing bath. This bath serves to remove the stain left on the film by the bleach.
After bleaching the film is flashed. This flashing exposes all the silver remaining after the bleach. Then after another wash the film is given a second development. The second developer serves to blacken all the silver that was not carried away by the bleach. This gives a positive image. Therefore the white card which was black on the negative and clear film after bleaching, will project as white. The black card which • Continued cm Page 791