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April, 1941]
LATENT IMAGE STABILITY OF FILM
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terms of hours and we in terms of months, and it is possible that there is an increase of the developable image for a short time after exposure followed by a regression. This regression is not even necessarily related to the growth or intensification effect. In fact, at no time in our work did we observe the growth effect followed by regression of the developable image. On the contrary, the growth effect reached a maximum which was maintained throughout the balance of the test. The time required to reach this maximum varied with the individual emulsion from a few weeks to 9 months but was not characteristic
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FIG. 10.
0.2 0.4 0.6 0.8 LOO 1.20 1.40 DENSITY
Graininess-density curve for high-speed panchromatic motion picture negative film no. 1.
of any particular emulsion grouped according to speed or sensitization. In comparing Bullock's results with ours, it should be remembered that besides the difference in magnitude of the intervals studied he used an intensity-scale exposure method while we used a time-scale method.
Effect of Image Growth on Grain. — Our investigations showed that in many cases the growth of the developable image with age was accompanied by an increase in graininess. In order to get a better approximation of the difference in graininess than that afforded by grain enlargements, use was made of the graininess meter described by Goetz.9 The graininess-density curve for the higher speed panchromatic negative film, whose sensitometric curves are given in