35mm negative on cellulose nitrtate support.
Silver particles are suspended in a gelatin binder layer on a plastic support.
Process DescriptionThe image is formed by concentrations of filamentary silver particles suspended in a gelatin binder. The image is supported on a clear plastic base, commonly nitrate, acetate, or polyester. Orthochromatic emulsions are sensitive to only blue and green light and were the first kind used in motion picture film. In 1913, panchromatic emulsions were introduced for motion picture film with extended light sensitivity to red light. These more expensive panchromatic emulsions were initially used for additive color processes. In 1922, panchromatic motion picture film stock was released for general use, and by 1930, it had replaced orthochromatic stock as the standard in black and white motion picture photography. |
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