Color Balance and Film

Color film can record colors that your eye does not
see when the picture is made. This is because film is
manufactured to reproduce color accurately under
specific lighting conditions. If the picture is made
under the wrong lighting, colors in the photograph
become unbalanced, which means that there is an
unwanted color tint (or color cast) over the entire
photograph.
For example, if daylight-balanced film is used
indoors under incandescent light bulbs, objects that
are supposed to look white, such as a white shirt,
will be rendered with a red tint. This is because
incandescent light bulbs produce more light in the
red wavelengths than daylight does.