Lesson l/Learning Event 1
Figure 1-1.
Exposure
b. PROCESSING: Processing, also referred to as developing consists of a
series of steps that will develop the latent image into a visible image
through the use of chemical solutions. These steps are:
(1) Developer -- Here the exposed film is immersed in a chemical
solution (developer) that will change the exposed portions of the film to a
visible image of the subject photographed.
(2) Stop Bath -- To stop the action of the developing agent and thus
prevent over-developing, the film is rinsed in a diluted acetic acid
solution.
(3) Fixing -- The film is then placed in another chemical solution
which dissolves the unexposed and undeveloped parts of the emulsion. These
parts are left clear.
(4) Wash and Dry -- Film is washed in running water so that all
chemicals and unwanted particles art removed. If any chemicals remain the
image will fade over time.
The film is then dried, and the result is a
"negative." A negative is an image of the subject photographed in which the
various tones appear reversed (fig 1-2).
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