UV tattoos are also known as black light tattoos or ultra-violet tattoos as these tattoos are normally invisible but glow only under black light or ultra-violet light. These are good for people who would like to hide their tattoos but would like to show off their designs only under special conditions like black light, etc.

As there are frequent reporting of rashes and infection with UV tattoos, many parlors refuse to take on UV tattoo assignments. Though there are several types of UV inks now available which have undergone severe FDA testing and are reporting lesser side effects, the inks are still considered to be highly carcinogenic and also allergenic. (http://www.tattooology.com/uv-tattoos-glow-in-the-dark.html)