Any form of visible light can activate the tattoo, including the flashlight on your phone, and to reverse the reaction, you use a UV flashlight. These two forms of light can display and hide the ...

He showed me on himself with a small red heart tattoo on his wrist—a few seconds of a white light flashlight and it was gone, and a few seconds in front of a UV flashlight and there it was again.

What’s cool about black light tattoos is the creative ... to your going-out aesthetic (consider bringing a black light flashlight with you to happy hour). Whether you just want to add something ...