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Story summary
- Researcher Carson Bruns created PhotoTat, a tattoo ink that can be switched on and off.
- PhotoTat’s dyes color under UV light and erase under bright light, requiring users to wear sunscreen.
- The ink provides 16 colors and 300 shades but cannot produce white.
- Bruns says the polymer is non-toxic while dye toxicity remains unknown.
- Signe Bedsted Clemmensen (University of Southern Denmark) warns the ink may share cancer risks of tattoos.