Glossary of Printing Terms:
Reciprocity

Most films are designed to be exposed within a certain range of exposure times-usually between 1/15 second to 1/1000 second.

When exposure times fall outside of this range-becoming either significantly longer or shorter-a film’s characteristics may change.

Loss of effective film speed, contrast changes, and (with color films) color shifts are the three common results.

These changes are called reciprocity effect.


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