Lesson 1: The Photographic Process

Laboratory Procedures
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LESSON 1

THE PHOTOGRAPHIC PROCESS

TASK

Determine the types and uses of chemistry for both black and white and

color; the procedures for processing negatives and prints; and the

procedures for mixing and storing chemistry.

CONDITIONS

Given information and diagrams on the types of chemistry and procedure for

mixing and storage.

STANDARDS

Demonstrate competency of the task skills and knowledge by obtaining a

minimum passing score of 75 percent of the multiplechoice test covering the

preparation of photographic chemistry.

REFERENCES

None

Learning Event 1:

PREPARE PHOTOGRAPHIC CHEMISTRY

1. Chemical reaction. When an exposure is made, a chemical change takes

place in the lightsensitive silver halides. During this chemical change,

the silver halides suspended in the gelatin emulsion layer produce a latent,

or invisible image.

a. The film is then immersed in a photographic developer. The purpose

of the developer is to continue the chemical reaction that began with the

exposure to light. This step converts the exposed silver halides to black

metallic silver, forming a visible image.

b. After the image appears, the emulsion is rinsed in stop bath to stop

further development of the halides.

c. Next, the film is placed in a fixing solution. The fixer converts

the unexposed, undeveloped silver halides into watersoluble salts. These

are removed in the fixer and the image is made permanent.