So if you're looking for a tattoo but don't want it all the time, you may be interested in an invisible tattoo. It's actually the newest rage in ink. Also known as blacklight tattoos, this style of tattoo has been around for a while but is really growing in popularity with club-goers as well as traditional tattoo lovers looking for something different.
The ink only shows up under a black light, which is why some call it an invisible tattoo. The trick is the UV paint that is used. However, keep in mind that UV tattoo paint is a lot thinner than regular tattoo paint, so you need to make sure that the artist applying it has experience working with UV paint because the results can be disastrous.
Invisible pink is also more frequently rejected by the skin, and in some cases, the irritation is so severe that the ink has to be removed. And be advised, for the first year or two, they won't be completely invisible, not until the raised, tan lines fade completely. But it will become harder to see with every month that passes until it becomes virtually invisible to the naked eye.
Source: OddityCentral