Once the hallmark of bikers, sailors, and general riff-raff, tattoos have become far more mainstream, decorating the bodies of everyone from teachers to lawyers to world-class surgeons. Nonetheless, ...

UV tattoos use a fluorescent dye, which means the tattoo only appears under UV light. There is little evidence on whether UV tattoo ink is safe for human skin. UV tattoos, also known as black light ...

A team of engineers has designed a new line of multicolored tattoo inks that switch on and off with different kinds of light. Described in a study published in Matter & Light, the technology could one ...

Tattoos could be radically reimagined following the development of inks that can be turned on and off by exposing them to light. This could be used medically – or to hide the butterfly on your ankle ...