The effect of the 460nm film changes the colour of your picture monochromatically. Depending on exposure and the development and scanner settings of the photographic lab the pictures either appear blue/violet or yellow/green. Underexposure intensifies the colour, whereas overexposure dampens the effect of the film. Since the effect covers the whole picture, but will not obstruct any parts of the motive, the film is really universally usable.