Blacklight tattoos, also known as UV tattoos, are tattoos
made using specially devised ink that is visible when seen under an
ultraviolet light, or blacklight. For someone reluctant to get a
traditional tattoo, perhaps because they do not want to draw attention
to themselves, a blacklight tattoo is an option.
Source:http://www.tattoo.com/blog/under-blacklight-scoop-uv-ink
