Developer:
When a photo is taken and the shutter opens, light hits the film and it becomes exposed. When the film is exposed, an invisible image is formed on the film called a latent image. The developer is what makes this latent image visible. It makes the parts of the film that have been exposed by the light darker creating what we recognize as a negative. The developer transforms the light sensitive chemicals in the film, silver halides, that record the image to elemental silver. The longer the developer is in contact with the film, the more silver halides are changed to elemental silver, therefore, the darker the image. The ideal time the film is washed in the developer depends on the type of film and can be found on the bottle of developer being used.
Fixer:
After the film has been processed with the photographic developer and washed with water, it is treated with photographic fixer. The fixer is a crucial step when developing film because the fixer stabilized the image on the film and keeps it from being further affected by light. It does this by removing the silver halides that have not been exposed leaving behind only the elemental silver that had been changed by the developer and created the visible image. The active ingredients in fixers are various sulfates.
Katherine
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