What happens if the film is not adequately washed after processing?

If the film is not adequately washed after processing, it may develop a yellow or brown stain. This staining occurs due to the residual chemicals from the processing solutions, particularly the developer and fixer that remain on the film's surface or within its emulsion layer. Proper washing is essential to remove these chemicals, preventing their interaction with the film over time. If not removed, the residual developer can continue to develop the film when exposed to light, causing discoloration, and ultimately leading to a less diagnostic-quality radiograph.

The other outcomes listed, such as the film being too dark, becoming very dense, or completely clear, are typically associated with different processing errors or exposure techniques rather than inadequate washing. Thus, the key result of poor washing is the development of those unwanted stains, which can render the radiograph less useful for diagnostic purposes.