Society of Motion Picture Engineers : incorporation and by-laws (1929)

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Fill f -Grain Developers — Cavltem anel Cvdhivee 415 grain developers and tlie Watkins factor lias been fonnd to be 8.0 for a gamma of 0.7. D. Variations of Properties ivith Methods of Mixinej In some preliminary experiments, variations were found in the rate of development for different batches of the same developer. A test Avas made to determine the effect of varying the mixing temperature. One developer was compounded^^ with water at room Ficr RE 2. Time-Gamma and Time-Fog Curves for Borax Developer at Dififeient Temperatures.' (Eack and Tank Method). Eastman Xegative Panchromatic Motion Picture Film, Type 2). temperature (65° F.) and another with water at 180° F. Both developers gave the same rate of development. From this it was concluded that the early variations were due to errors in compounding the developers. It is necessary to exercise great care in weighing out the correct quantity of borax because the borax developer is very sensitive to slight changes in alkalinity. In a very dry climate, borax sliould be stored in a closed vessel to prevent any loss of the water of crystallization, E. Function of the Constituents of the Borax Developer 1. Developing Agents. Elon is the principal reducing agent and is responsible for starting the development of the negative. The hydroquinone helps to build up tlic heavy densities, but if