No 400 ISO film on hand and there's a beautiful low-light situation? Only 100 ISO film in the fridge, but you would love to photograph something in motion? Or you want loud contrasting without cross processing? Here's a Solution!
"Pushing"is actually a well-known photographic technique. Simply put, it involves underexposing film and then having to over-develope it. So insert a 200 iso Film and set the camera to 400 iso. Shoot the entire roll of film and then write “Please push one stop” on the film cassette. I’ve always wanted to try this and now – after I finally dared to – I am delighted with the results: strong contrast, slight color shift and larger grain.
It is even possible to push by one more stop. For example, 100 iso Film can be exposed at 400 iso. Or 400 iso Film at 1600 iso Film. Two stops is the reasonable maximum for color negative, but it is possible to push even further with B&W films.
Testing push processing should also be done with cross-processing or Redscale. So there’s still a lot to try!