When the specific light balance of color film is improperly matched to a light source, the colors in the recorded image won’t match those of the original scene. In this case, color balancing, or conversion filters (available in varying tones—A, B, and C), can be used to correct differences in color temperature between the film and the light source.
When color film balanced for daylight is used in tungsten light, the colors in the resulting image will have a yellow cast. This effect can be corrected with the use of a blue 80A filter, which will neutralize the yellow to give balanced color. Exposure should be increased two stops when using these filters.
Conversely, color film balanced for tungsten light that is used in daylight will result in an image with a blue cast. In this scenario a yellow/orange 85B filter will neutralize the blue to result in a photo with true colors. Exposure should be increased one stop when using these filters.
Daylight balanced film can be used under fluorescent light and with electronic flash, as they have a similar color cast (temperature).