High Quality Content by WIKIPEDIA articles! The sodium vapor process is a technique for combining actors and background footage, developed exclusively by The Walt Disney Company as an alternative to the more common bluescreen process. An actor is filmed performing in front of a white screen and lit with powerful sodium vapor lights. Sodium light is used because it is a narrow spectrum source that falls neatly into a notch between sensitive layers of the color film. This allows the complete range of colors to be used in costumes, make-up, and props. A camera with a beamsplitter prism is used to expose two separate film elements.

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