Tattoo ink vanishes in sunlight, stays switchable in skin for up to 2.2 years

Read the original at Times of India ↗
Times of India · collected 2026-10-11 · by TOI Science Desk

Quick Summary

Researchers are developing PhotoTat, a light-sensitive tattoo ink that can change color when exposed to specific wavelengths of light and fade within seconds in sunlight. The ink uses photochromic dyes enclosed in PMMA nanoparticles and can be switched on with an ultraviolet LED. In tests, the ink remained switchable for up to 2.2 years, offering temporary visibility while keeping the design concealed otherwise. This technology could allow tattoos to change color or disappear from view without removing pigment from the skin.
Written locally by qwen2.5:14b on 2026-10-11, using this article's own text rather than the other coverage of the same event (that is the story summary below).

AI analysis runs on qwen2.5:14b, locally

Story summary

Researchers at the University of Colorado Boulder have developed a new type of tattoo ink called PhotoTat that can be made to vanish under sunlight and then reappear later. This innovation involves pigments containing photochromic dyes, which change their molecular structure when exposed to specific wavelengths of light, altering how they appear on the skin. The team, including Carson Bruns, an associate professor of biomedical engineering, created inks in blue, magenta, and yellow primary colors. These inks can remain switchable for up to 2.2 years without fading or needing maintenance. Potential applications include temporary tattoos that can be used for medical purposes such as UV exposure monitoring and radiation detection, offering a reversible and less painful alternative to traditional permanent tattooing methods.

Written for “Switchable Tattoo Ink” on 2026-10-11, grounded in this article and the 0 other(s) covering the same event.
Why this leaning score
This article does not take a side on a contested political question, so it has no leaning score. That is an answer rather than a gap: a match report or a rescue can be warmly or critically written without being left or right, and scoring it anyway is how approval of a subject gets recorded as a political position.
No political leaning scored for article 71997 · logged 2026-10-11

Signals How these are calculated →

Claims extracted
38
claim-shaped sentences
Uncertain
34%
13 of 38 hedged
Leaning
not political
takes no side on a contested political question
Correction & hedging signals
58.9
corrections and hedging in what we collected; not a measure of accuracy
Outlets on this story
1
Science
Narrative spread
1
articles carrying this framing
Analyzed 2026-10-11 · how these are computed

Story

📰 Switchable Tattoo Ink
Science · 1 article(s) covering the same event.

How this is being covered How these are calculated →

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Publisher

Times of India · 2226 article(s) · 2 correction(s) detected
Running correction rate · 2 correction(s)
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Who wrote this

TOI Science Desk
230 article(s) here · 1 carrying a prediction
🔮 But what if body art could be switched on for a night out and made to disappear the next morning?
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🔮 By 2018, they had found that the wells could provide up to 74% of the surface water available at one site.
🔮 Only 17.7% of the radiolocations of tagged individuals involved snakes that researchers could observe without disturbance.
🔮 A drone may help scientists find Burmese pythons hidden across the Everglades.
🔮 Such a herd would be expected to lose much of its genetic variety.
🔮 This means the beetle that eventually established may have entered Hawaii as part of a shipment intended to introduce a different Calosoma species.
🔮 The results, however, also show that restoring the meadow's soil and its ability to store carbon could take several decades.
🔮 The fish could then spend time near the partner they preferred.
🔮 The central lesson is that providing suitable limestone substrate can help oysters return to a degraded reef, but lasting recovery will also require understanding why oyster populations declined in the first place and protecting the remaining reef habitats.
Wire or desk byline, not an individual reporter.
Also by TOI Science Desk
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Topics

Live Science PhotoTat the University of Colorado Boulder

Subjects

Live Science ORG · 2× Bruns PERSON · 1× Carson Bruns PERSON · 1× PhotoTat ORG · 1× the University of Colorado Boulder ORG · 1×

Narrative

Bruns has also worked on other smart tattoo technologies, including designs intended to measure ultraviolet exposure and indicate exposure to dangerous gamma radiation.
framing: mixed · carried by 1 article(s) · first seen 2026-10-11
🔮 But what if body art could be switched on for a night out and made to disappear the next morning?

Claims (38 extracted, 13 hedged)

A tattoo has traditionally been a commitment etched into the skin, with removal often involving multiple laser sessions, discomfort and considerable expense. asserted
removal → etch → sessions
But what if body art could be switched on for a night out and made to disappear the next morning? uncertain
art → switch → night
Researchers are developing a light-sensitive tattoo ink that could make that possibility a reality, while opening up intriguing applications in medicine. uncertain
possibility → develop → medicine
According to a report by Live Science, the technology, called PhotoTat, uses specially engineered pigments that respond to different wavelengths of light. uncertain
that → accord → light
Developed by a team including Carson Bruns, an associate professor of biomedical engineering at the University of Colorado Boulder, the system could eventually allow tattoos to change colour, remain hidden until needed or disappear from view without removing the pigment from the skin. uncertain
tattoos → develop → skin
Ink that responds to light asserted
that → respond → light
According to Live Science report, PhotoTat uses three primary-colour inks — blue, magenta and yellow, containing photochromic dyes. uncertain
PhotoTat → accord → dyes
These compounds alter their molecular structure when exposed to particular wavelengths of light, changing how they appear. asserted
they → alter → light
The dyes are enclosed in nanoparticles made from polymethyl methacrylate (PMMA), a glass-like plastic also used in certain medical implants and dermal fillers. asserted
dyes → enclose → implants
This formulation allows the pigments to be incorporated into the skin while retaining their ability to respond to light. asserted
pigments → allow → light
A 365-nanometre ultraviolet LED can activate the pigments in approximately two to three seconds. asserted
LED → activate → seconds
Once switched on, the colours can remain visible for hours or even days under ordinary indoor lighting. asserted
colours → switch → lighting
Exposure to bright outdoor sunlight, however, makes them fade within seconds, the report adds. asserted
report → make → seconds
The effect does not mean the tattoo pigment vanishes from the body. asserted
pigment → mean → body
Instead, the ink changes its visible appearance, allowing the design to become effectively concealed. asserted
design → change → appearance
In tests, the researchers found that the three PhotoTat colour channels remained switchable in the skin for periods ranging from 1.4 to 2.2 years. asserted
channels → find → years
A tattoo that can change its look Different wavelengths can activate different sections of a design, giving wearers greater control over how their tattoos appear. asserted
tattoos → change → control
Magenta elements, for instance, can be activated with green light, while blue light can bring out yellow pigments. asserted
light → activate → pigments
The technology can also be combined with conventional tattoo ink. asserted
technology → combine → ink
A permanent black design could contain PhotoTat details that remain largely invisible until activated, creating artwork with an additional visual dimension, explains the report. uncertain
report → contain → dimension
Bruns has tested successive versions of the ink on his own skin, arranging different formulations into a series of scale-shaped tattoos. asserted
Bruns → test → tattoos
The experimental designs allow him to observe how individual pigments respond to light and how the system behaves over time. asserted
system → allow → time
For people who enjoy body art but hesitate over its permanence, the approach could offer a different kind of flexibility. uncertain
approach → enjoy → flexibility
It might also help tattoo enthusiasts temporarily conceal designs for professional or personal reasons without resorting to clothing or makeup. uncertain
enthusiasts → help → clothing
From body art to medical applications According to the report, the more consequential possibilities may lie beyond aesthetics. uncertain
possibilities → accord → aesthetics
Patients undergoing radiation therapy sometimes receive small permanent tattoos to help medical teams align radiation beams accurately. asserted
teams → undergo → beams
PhotoTat could potentially make such markings visible during treatment and conceal them once they are no longer required. uncertain
they → make → them
Similar applications might be explored in surgical settings, where temporary visual markers could help clinicians during procedures without leaving permanently visible marks afterward. uncertain
markers → explore → marks
Bruns has also worked on other smart tattoo technologies, including designs intended to measure ultraviolet exposure and indicate exposure to dangerous gamma radiation. asserted
Bruns → work → radiation
Such developments could eventually offer specialised monitoring tools for people working in environments where radiation presents a risk, the report claims. uncertain
report → offer → risk
What comes next? asserted
What → come → ?
PhotoTat is still an emerging technology, and its broader applications will require further research. asserted
applications → emerge → research
So far, only the purple ink has been commercialised, following third-party medical testing. asserted
ink → commercialise → testing
It is available for around $100 for a small bottle, making affordability another hurdle before widespread adoption. asserted
affordability → make → adoption
Researchers hope to bring additional colours to market and reduce production costs as development progresses. asserted
development → hope → costs
Questions about long-term safety, performance and practical use will also matter as the technology advances. asserted
technology → matter → safety
For now, the idea of a tattoo that can disappear without being removed remains a promising experiment. asserted
that → disappear → tattoo
If further research supports its potential, light-sensitive ink could eventually transform body art from a permanent statement into something far more adaptable and give medicine another way to make useful markings visible only when needed. uncertain
markings → support → way
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