What does cross-processing slide film do, and is it useful for conventional photography?
Asked 1/21/2015
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I’m trying to understand, in objective terms, what cross-processing transparency (slide/reversal) film is for. Is the main purpose simply to create unusual color shifts, contrast, and other “quirky” effects, or can it offer any real benefit for more conventional photography?
I’m especially confused because some films marketed for this use are described as fine-grained, while user comments often describe the results as grainy. What should someone realistically expect from cross-processing slide film, particularly when reversal film is developed in C-41 or negative film is developed in E-6?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
11y ago
2 Answers
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There is nothing "conventional" about cross processing. Cross processing is the deliberate processing of a film in a chemical process for which it was not designed.
The most common types of cross processing are :
- Processing color negative films with the E6 process
- Processing color reversal films with the C41 process
Processing color negative film in E6 will result in a positive image on the film but with a distinctly orange cast due to the orange mask layer incorporated into negative films.
Processing color reversal film in C41 will result in a negative image on the film but the film will not have the typical orange cast found on most film negatives.
It is possible to cross process other types of films in chemistry for which they haven't been designed (e.g. color film processed with black and white developers), but in all cases it's done to achieve a creative effect.
Note, there are some films, particularly black and white films, for which there are multiple developers recommended depending on the desired use case. For instance, Kodak Technical Pan Black and White film can be shot at a variety of exposure indexes ranging from EI 16-200 then processed with various developers to achieve a range of contrasts from a typical photographic contrast index of about 0.5 to an extreme contrast typical of that of a lithographic film (CI ~2.5). This, however, is not usually considered "Cross Processing"
Originally by user38877. Source · Licensed CC BY-SA 4.0
user38877
11y ago
0
Generated from our catalog & community — verify before relying on it.
Cross-processing means deliberately developing a film in chemistry it was not designed for. The two common cases are:
- color negative film in E-6
- color reversal/slide film in C-41
The point is usually not “conventional” image quality. It’s mainly a creative effect: unusual color shifts, altered contrast, and unpredictable rendering.
In general:
- Negative film processed in E-6 gives a positive image, often with a strong orange cast because negative film includes an orange mask.
- Slide film processed in C-41 gives a negative image, but without the usual orange mask of standard color negative film.
So yes, the main attraction is the distinctive look rather than a technical advantage for normal, color-accurate photography. If your goal is conventional results, cross-processing is usually the wrong tool.
As for grain: cross-processing itself can make results look rougher, harsher, or less normal, so people may describe the output as “grainy” even if the film stock is marketed as fine-grained under its intended process. Expect less predictability than with standard processing.
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