Figure 2: Light fog artefacts. An open edge of the cassette before and after X-ray sensitization exposes film to visible light resulting in film blackening (fog). The surface area of film exposed determines the extent of fogging. The darker areas in the image above represent higher intensity of light, and it is always at the edge. The dark cloudy fog shown superior to the uniformly dark band below is as a result of both light-leak and dropping/vibration of cassette on the floor during handling