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developing tank
A developing tank is a light-tight container used for developing film. A developing tank allows photographic film to be developed in a daylight environment. This is useful because most film is panchromatic and therefore can not be exposed to any light during processing. Depending upon the size and type, a developing tank can hold one to many roll or sheet films.
A film reel holds roll films in a spiral shape. The film is held evenly spaced so that the chemicals in the developing tank reach all of the film.
==Types==
Developing tanks and film reels for roll films come in two varieties: plastic and stainless steel. With stainless steel reels, the film is clipped to the center and then gently pinched while the reel is turned so that the film falls into the reel's grooves. With a plastic reel, the film is loaded from the outside and then wound onto the reel by rotating the reel with a back-and-forth motion.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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