LESSON 1
CHEMICAL MIXING AND STORAGE
OBJECTIVE:
In this lesson you will gain a knowledge of chemical mixing and storage. Chemistry is essential
for all photography. The photographer must depend on the chemical processes to produce the negatives
and prints which are his/her ultimate goal. In some instances, in Army photography, compounded
chemicals known as prepared chemicals, or ready mixes, are not available because of economic or other
reasons. In any event, it may be up to you to mix your own processing solutions, and unless they are
safely, carefully, and properly handled and mixed, the results may be inferior or even DISASTROUS.
The learning objectives of this lesson are as follows:
1.
STATE why chemicals should be stored in airtight containers.
2.
STATE why a chemical formula would require more monohydrated chemicals then
desiccated chemicals.
3.
LIST four ways to purify water.
4.
STATE why equipment and containers made of iron, tin, or zinc should not be used for
mixing or storing chemical solutions.
5.
STATE why solutions should not be mixed with the shaft of the electric mixer in the
center of the container.
6.
REARRANGE in their proper sequence, a given list of steps that are required when
mixing a photographic solution from bulk chemicals.
7.
STATE how all chemicals should be regarded and handled.
8.
STATE the recommended publication to reference for obtaining information about
photographic chemicals, solutions, and formulas.
3
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