There is the interesting idea of getting a tattoo that is invisible under ordinary light. But when the tattooed area goes under a UV light, it comes alive! For this, there are approved ultraviolet reactive ink for tattoos.
Elements that glow in the dark without help from UV light contain phosphors – a substance that glows brightly after being ‘charged’ under another source of light. Inks with phosphors have been used in tattooing. However, none of them has been approved to be used. Why? Phosphors are a known carcinogen – to make phosphors more visible and emit more light, a tiny amount of radioactive substance is added.
Practice caution if you want to get one. Know what type of ink that is going under your skin.
For more black-light tattoos, check out these 18 Stunning Black-Light-Responsive Tattoos.