It’s so much cooler than a sticker—it's real tattoo ink that you can “turn on” or off using different wavelengths of UV and white light. He showed me on himself with a small red heart ...

There is little evidence on whether UV tattoo ink is safe for human skin. UV tattoos, also known as black light tattoos, are invisible under regular lighting and only appear under UV light due to ...

At the moment, Magic Ink is only available in red ink ... light can activate the tattoo, including the flashlight on your phone, and to reverse the reaction, you use a UV flashlight.