Researchers have demonstrated that experimental tattoo inks designed to change color in response to light remained functional in human skin for over two years, suggesting potential for long-term applications in medical or cosmetic uses. The findings highlight a promising but still unproven technology that could one day enable dynamic, reversible skin markings. However, experts emphasize that further safety assessments are required before such inks could be considered for widespread use. The study raises questions about durability, biological effects, and practical feasibility in real-world settings.
Experimental tattoo inks stayed light-switchable for up to 2.2 years in one researcher’s skin. Broader safety testing is needed.
