University of Colorado Boulder Develops Photochromic Ink
Researchers have created light-sensitive tattoo inks that appear or vanish when exposed to different light spectrums.
Updated on Oct. 30, 2026 in Chemistry
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Researchers at the University of Colorado Boulder have developed PhotoTat inks that change color when exposed to specific light sources. These chemical-based tattoos are designed to transition between visible and invisible states for personal and professional settings.
Why it matters
This technology provides a method for individuals to reveal or conceal body art based on their environment, potentially bridging the gap between professional appearance and personal expression. The development represents a shift toward more dynamic, customizable cosmetic applications.
The researchers developed blue, magenta, and yellow pigments encapsulated in poly(methyl methacrylate). Activation occurs with two to three seconds of UV light, while a blast of white light reverses the reaction.
The players
University of Colorado Boulder
This public research university in Colorado served as the primary institution where the development of PhotoTat inks took place.
Hyprskn
This biotech company is based in Colorado and released a commercially available red photochromic ink in 2024.
The details
The ink functions by forming a new ring in the dye molecule when exposed to UV light, which is then broken by white light. While Hyprskn launched a red Magic Ink in 2024, the team continues to refine the stability of other colors, as the blue variant currently degrades after 10 to 100 uses.
Timeline
Hyprskn launched its red Magic Ink in 2024.
This article was published on October 30, 2026.
General use of these inks in tattoo shops is expected to take several years.
The Big Picture
The development of these inks must align with EU Reach safety regulations to ensure consumer protection. This requirement marks a necessary evolution in cosmetic science as researchers attempt to integrate complex chemical reactions into the human body.
The 2 ml vials of Magic Ink are currently priced at 77 pounds for consumers interested in early adoption. Users should note that these tattoos may activate unintentionally in direct sunlight if not protected by sunscreen.
The takeaway
Consumers should wait for thorough safety and toxicity testing before considering these inks for permanent application. The current technology is an early-stage innovation that is not yet ready for broad commercial implementation in standard tattoo shops.
Further reading
For more on the latest innovations in chemical applications, visit the Chemistry section.
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