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Developing Time Based On Temperature Changes

Ideally, your film developer and other chemicals should all be used at 68°F. In reality, temperatures can vary widely unless you have an expensive fluid control system installed in your darkroom.

Fortunately, we have found an easy Fahrenheit chart that works great.


64° 66° 68° 70° 72° 75° 77° 80°
5:00 4:30 4:00 3:30 3:15 2:30 N/R N/R
5:30 5:00 4:30 4 3:45 3:00 N/R N/R
6:00 5:30 5:00 4:30 4:00 3:15 N/R N/R
6:30 6:00 5:30 5:00 4:30 3:30 N/R N/R
7:15 6:30 6:00 5:30 5:00 4:00 3:45 N/R
8:00 7:15 6:30 6:00 5:15 4:30 4:00 3:30
8:45 7:45 7:00 6:30 5:45 5:00 4:30 3:45
9:15 8:15 7:30 6:45 6:00 5:15 4:45 4:00
9:45 8:45 8:00 7:15 6:30 5:30 5:00 4:15
10:30 9:30 8:30 7:45 6:30 6:00 5:30 4:45
11:15 10:00 9:00 8:00 7:15 6:15 5:45 5:00
11:45 10:30 9:30 8:30 7:45 6:30 6:00 5:15
12:30 11:15 10:00 9:00 8:00 7:00 6:15 5:30