Halation is the effect that occurs when the bright areas of an image appear to softly bleed around the edges of dark areas. This is caused by light going through the emulsion layer, bouncing off the base of the film and exposing the adjacent emulsion. Some film is manufactured with a black anti-halation coating on the base side.thepolliofolioglossaryofcinematographyterms
Blurred effect at the edges of a highlight area of a photograph caused by reflection of light that passed through the film. The light is reflected from either the surface of the film or the camera back.
A defect of photographic films and plates. Light forming an image on the film is scattered by passing through the emulsion or by reflection at the emulsion or base surfaces. This scattered light causes a local fog that is especially noticeable around image of light sources or sharply defined highlight areas.
A phenomenon that arises when light scattered within the film emulsion continues through the film base and is reflected.