This 1948 US Navy training film (MN 5383) instructs on how to develop negatives. It goes through all of the necessary steps and accompanies this with animations showing how the chemical process works. It also goes over common mistakes like having a room that is not dark enough, leaving fingerprints and water on the negatives, and drying them in a place that is too warm.

0:15 US Navy Training Film “Fundamentals of Photography – Developing the Negative”, 0:30 a picture of a sailor with arrows showing different shades, 0:54 the same picture’s negative, 1:10 a photographer taking a picture of a pyramid for a study of reflective light, 1:43 animation showing how light is reflected towards the camera lens and an image is formed on film, 2:22 animation showing how light affects a cross section of a film, 3:32 light shining on a piece of film, 4:06 the photographer showing how to develop pictures with different tanks, 5:07 photographer uses a film hanger to check that there is enough solution in the tanks, 5:55 photographer checks the temperature of the solutions in the tank, 6:25 photographer puts film onto hangers and begins putting them in the different tanks to develop them, 7:50 photographer mixing the negative developer chemicals together with animations showing the names of the different chemicals, 9:48 animation showing how the different chemicals work together using the analogy of an engine, 11:00 enlarged animated cross section of a film showing what happens during development, 12:24 animation of a cross section of film of what happens in the fixing bath, 13:53 animation of a cross section of film showing what happens when the film is washed, 14:32 photographer wipes washed film with a sponge and hangs them to dry in the drying cabinet, 15:31 overview of the completed negatives, 15:47 “The End” MN 5383

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