Expansion and Contraction Development Times

The following formulas will give you a shortcut method of computing your Normal Plus and Normal Minus Development times. A pocket calculator will make these computations very simple. Notice that special procedures are necessary to achieve good results with Expansions or Contractions of more than N + 2 or N - 2. Refer to Appendix H for more information on extreme Expansion and Contraction development and the use of compensating developers.

Note: You will probably have to adjust the development times that you derive from these formulas as you go along. Keep careful records of your results.

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