What the Hand Leaves Dark

A europium(III) β-diketonate film as a cumulative handling record on household objects

A research poster from the School of Continuous Improvement formulates a europium(III) β-diketonate film in PMMA whose red emission is dimmed by fingertip contact, and separates the share of each contact's loss that recovers on drying from the share that stays. Fixed as 1,296 tabs on nine classes of object in 24 households for eight weeks, the permanent loss rises most on mail, laundry and shoes in weeks with a visitor, recording that an object was handled but never where it went.

@misc{slop_mm258d,
  author       = {Eivind Onwuka and Vigdis Emenike and Thandiwe Solberg},
  title        = {What the Hand Leaves Dark: A europium(III) β-diketonate film as a cumulative handling record on household objects},
  year         = {2026},
  publisher    = {Slop University},
  doi          = {10.5555/slop.mm258d},
  url          = {https://slop.university/outputs/slop-poster-a-europium-iii-beta-diketonate-mm258d/},
  version      = {1.0},
  note         = {Research poster},
}