acetate a clear sheet plastic, cellulose triacetate, used as a base for motion picture film and filter gels

additive process a system of color photography that adds together lights of the three additive primary colors—red, green, and blue—in different degrees to form an image; the additive process is no longer used in cinematography, although a form of it is still employed in video imaging

aerosol diffusion an aerosol spray used to create a fog or smoke effect

alternating current (AC) electrical current that reverses directional flow at regular intervals; in the United States, electrical current supplied by power companies alternates ...

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