A breakthrough in tattoo technology allows for temporary ink that can be activated and erased almost instantly using ultraviolet light and sunlight. The process involves a specialized LED that triggers pigment visibility within seconds, while exposure to bright sunlight reverses the effect—leaving no trace despite the pigment remaining in the skin. Researchers say this could revolutionize body art, fashion, and even medical applications where reversible markings are needed. The discovery hinges on a unique chemical interaction between light and pigment molecules, offering a non-invasive way to control visibility without altering the skin.
A 365-nanometer ultraviolet LED can switch a tattoo pigment on in about two to three seconds, and bright sunlight erases the color again within seconds, even though the pigment stays in the skin. That ...
