What are the pros and cons of glow in the dark tattoos? You should know all the facts before you leap into a UV ink tattoo Read More!. UV tattoos or blacklight tattoos are tattoos made with dyes that fluoresce visibly under an ultraviolet light, not unlike fluorescein or rhodamine. Depending upon the ink chosen a UV tattoo can be nearly invisible when the ink is visible in normal light (as with a regular tattoo) and the ink will glow vividly under UV light. Some fans are taking inspiration from Harry Potter's Marauders map for glow -in- the-dark tattoos. The tattoos are done using UV (or black light) ink, which means.