What are Fluorescent Inks?
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. On the downside, fluorescent inks are not colorfast and will fade in bright light and sunlight over time. They can also have a negative effect on dot gain and trapping, making the printing less sharp and without as much detail. see also dot gain, trapping