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Why is a film dried during processing?

Updated: 8/17/2019
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Modern film are made using a flexible clear plastic base over coated with Gelatin. The gelatin is the glue that holds the light sensitive chemicals to the film base. Gelatin is chosen because it is flexible, transparent, and porous. When the film is immersed in water, the gelatin swells. In this swollen state the chemicals of the developing process can penetrate and circulate within the gelatin. Since the chemicals used to develop film are dissolved in water, they are able to easily travel within the gelatin structure and do their job. After the film is developed the wet film is dried. As the gelatin dries it shrinks back to its original size.

In earlier times, egg whites were used in place of gelatin. Film makers would like to replace gelatin for this task with something other than an animal product. Gelatin is made from the bone and hides of animals. Because gelatin works and because it actually boosts the sensitivity of the film (higher ISO), no substitute for gelatin has ever been found. The mixture of gelatin with the light sensitive chemicals imbedded within is called an emulsion.

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Q: Why is a film dried during processing?
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