From their earliest days, silent films could be colored using nonphotographic methods. One means was to hand-color frames individually. Another method made it possible to use monochrome sections for mood (e.g., blue for night scenes or red for passionate sequences). Monochrome stock was created by “tinting” the film base or “toning” the emulsion (by bathing the film in chemical salts). The photography of color was theorized decades before it was developed for motion pictures. In 1855 the British physicist James Clerk Maxwell argued that a full-color photographic record of a scene could be made by filming three separate black-and-white negatives ...(100 of 19892 words)