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Programmable Magnetic Ink MagInk Unveiled: Printed Paper Can Be Rewritten Repeatedly

KAIST's MagInk technology uses magnetic nanoparticle ink to enable repeated erasure and rewriting of paper content through magnetic field control, supporting over 500 rewrite cycles per sheet.

On July 1, 2029, the materials science team at Korea's KAIST published a paper in Nature Materials demonstrating a programmable magnetic ink technology called MagInk. Paper printed with this ink can be repeatedly erased and rewritten through external magnetic field control, with each sheet supporting over 500 rewrite cycles.

MagInk consists of iron oxide nanoparticles suspended in an aqueous carrier, with particle surfaces coated in polymer shells of different colors. During printing, a specifically oriented magnetic field flips the target color particles to the paper surface; erasure resets all particles with a reverse field. The current version supports black, white, and red color switching at 300dpi resolution.

"This is essentially an electronic paper that doesn't need electricity," said corresponding author and KAIST professor Park Jae-hyun. "The difference is that our display medium is actual paper — bendable, cuttable, recyclable."

Initial application targets include logistics labels and industrial signage — scenarios requiring frequent information updates without video-level dynamic display. Professor Park estimates MagInk paper production costs at approximately $0.30 per sheet, with a lifespan of about two years.