Fluorescent inks are printing inks that both emit and reflect light. Generally, these inks are brighter and more opaque than traditional inks. Using one or more fluorescent inks can actually brighten a printed image – especially four-color process printing on uncoated stock.Fluorescent inks are based on pigments that have the ability to absorb Ultraviolet energy and virtually immediately re-emit this energy within the visible spectrum. The effect of this is to cause the print to glow and appear very bright in daylight conditions.