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April, 1941 ] LATENT IMAGE STABILITY OF FILM 387
(5) The intensification effect is most pronounced at low densities, and may be entirely lacking or replaced by a regression at high densities.
(6) The growth effect depends on the optical sensitization of the emulsion. Unsensitized emulsions show little growth effect, sometimes decided regression.
(7) The growth effect results in increased graininess but this increase is not sufficient to account for the gain in density.
(£) The spectral quality of the exposure illumination may influence the growth effect. This is suggested by the present work but requires a more accurate method for verification.
REFERENCES
1 HEISENBERG, E. : "Die Veranderung des latenten Bildes in Halogensilbergelatineschichten bei der Lagerung," Veroff. des wiss. Zentral-Laboratoriums der photographischen Abteilung, AGFA (I. G. Farbenindustrie Aktiengesellschaft), 3, S. Hirzel, Leipzig (1933), p. 47.
2 BEDDING, T.: "Continuating Action of Light," Brit. J. Phot., 36 (Sept. 20, 1889), p. 619.
3 ROGERS, W. I.: "Casket of Photographic Gems," London (1891), p. 35.
4 MEES, C. E. K.: "A constate un accroissement de sensibilite," Phot, and Focus, 39 (May 11, 1915), p. 338.
6 JAUSSERAN, G.: "Constation et etude quantitative du renforcement spontane," Rev. d'Optigue, 8 (March, 1929), p. 119.
6 BULLOCK, E. R. : "Sur le renforcement spontane de 1'image latente entre la pose et le developpement," Science et Industries Photographigues (May, 1930), p. 169; (Jan., 1933), p. 6; (Feb., 1933), p. 32.
7 EDER, J. M. (Editor) : "Jahrbuch fur Photographic und Reproduktionstechnik fur das Jahr 1905," Wilhelm Knapp, Halle a. S., 19 (1905), p. 364.
8 EDER, J. M. (Editor) : "Jahrbuch fur Photographic und Reproduktionstechnik fur das Jahr 1904," Wilhelm Knapp, Halle a. S., 18 (1904), p. 392.
9 GOETZ, A., and GOULD, W. O.: "The Objective Quantitative Determination of the Graininess of Photographic Emulsions," /. Soc. Mot. Pict. Eng., XXIX (Nov., 1937), p. 510.
DISCUSSION
MR. LESHING: With regard to positive film, our experience from day to day shows a considerable and rapid loss of image measured, not in weeks or days, but in hours and minutes. The loss of image is sufficient to make us split up our night's work into small portions and to avoid keeping our Cinex tests any length of time before development.
MR. COOK: This investigation started where previous investigations have left off. The prior work has pointed out that appreciable and important changes in the latent image may take place a very short while after exposure. Detectable changes may occur even within a few seconds. However, our investigation was