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386 K. FAMULENER AND E. LOESSEL [j. S. M. P. E.
Fig. 1, is shown in Fig. 10. From Fig. 1 we note that there has been no image growth at a density of 1.20. However, the density graininess curves do not approach each other at this density. Therefore, it appears that while the developable image becomes more grainy with age, this increase in graininess does not account for the increase in density.
Color-Sensitivity and the Growth Effect. — LeClerc in "Photography: Theory and Practice" says that Jausseran found that the growth effect is not the same for latent images produced by different radiations. In our work no more accurate check was made on the dependence of the growth effect on the spectral quality of the original exposure than was afforded by the Agfa step color-chart in pictorial tests. This indicates that there was less growth in the blue and green than in the yellow and red range on panchromatic emulsions. However, further work is being done using more accurate methods. One would expect less growth effect with a blue light exposure since it has already been established that growth of the developable image is closely related to the optical sensitization of the emulsion. Our results with unsensitized emulsions, such as motion picture positive film, show no growth effect in one case and a decided regression in the other.
Mechanism of the Growth Effect. — We do not feel that our data are sufficiently refined at the present time to permit conclusions on the mechanism of the growth effect. However, we have found in this investigation some facts that substantiate and some that contradict the theories that have been advanced to account for the phenomenon. We do not wish to discuss these until further more accurate work has been done.
SUMMARY
This investigation may be summarized as follows :
(1) This investigation differs from those of previous workers by tracing the change of the developable image over a period of a year rather than for several hours after exposure.
(2) A growth of the latent image varying from x/2 to 2x/2 stops was found in all the negative films tested.
(5) No intensification in one case and a decided regression in another was found with cine positive films.
(4) The growth effect depends upon the sensitivity of the emulsion, is more pronounced in fast than in slow emulsions.