Australian Dental Council (ADC) Practice Test

To decrease the density of a radiographic film, increasing the rinsing time can be effective because it can lead to a reduction in the amount of residual developer that remains on the film. When film is developed, it's subjected to chemical solutions that can leave behind remnants if not properly rinsed. If the developer is not adequately removed, it can contribute to a darker film density. By increasing the rinsing time, more of the developer is washed away, resulting in a lighter film density.

In contrast, increasing mA (milliamperage), exposure time, or developing time are factors that typically lead to enhanced density because they provide the film more exposure to the X-rays or extend the interaction time with the developing chemicals, thus darkening the image. These actions would generally contribute to a denser film rather than decrease its density.