{
  "id": 13143373,
  "title": "Tattoos could be turned on and off with light",
  "url": "https://urgent.news/2026/10/09/tattoos-could-be-turned-on-and-off-with-light",
  "topic": "science",
  "section": "Science",
  "published": "2026-10-09T15:00:00.000Z",
  "source": {
    "name": "New Scientist",
    "slug": "new-scientist",
    "url": "https://www.newscientist.com/article/2592938-tattoos-could-be-turned-on-and-off-with-light/"
  },
  "original_language": "en",
  "account": "Researchers have created a new type of tattoo that can be turned on and off using light. This innovation, called PhotoTat, utilizes photochromic dyes that change color when exposed to specific wavelengths of light. The technology, tested on silicone, is similar to traditional tattoos in terms of pigment implantation and application methods. By using ultraviolet light, the tattoo's color is written, while bright visible light erases it, allowing for repeated cycles. Currently, the tattoo can be made in 16 distinguishable colors and over 300 shades, with white being unavailable due to its reflective properties. A limitation is the gradual yellowing of the blue ink over time due to photo-degradation. The polymer encapsulating the dyes is non-toxic, but the dye's toxicity remains unknown. Safety studies are necessary before public availability. Experts warn that tattoo ink is a foreign substance that may pose health risks, similar to those associated with traditional tattoos.",
  "summary": "A new type of ink could overcome one of the main downsides of tattoos: the inability to make them invisible",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}