What error is indicated by a herringbone pattern on a film?

A herringbone pattern on a film typically results from having the film placed in the processor or the cassette in the wrong direction, which is referred to as the film being placed backwards. This pattern occurs due to the film emulsion's interaction with the processing chemicals in a way that is inconsistent with proper exposure and development. When the film is not positioned correctly, it can create unusual artifacts and patterns that are characteristic of this error.

Understanding the characteristics of film exposure helps in identifying issues related to film processing. Other options such as underexposure or exposure to light manifest in different ways, such as a lack of image detail or fogging, respectively. Similarly, incorrect positioning normally results in blurring or an inadequate area being captured on the film rather than a patterned effect.