Turning leather belts/ watch straps into energy storage using a CO2 laser to etch conductive patterns directly onto vegetable-tanned leather

https://www.eurekalert.org/news-releases/1123305

"single step converts leather surface into porous/ conductive microsupercapacitors, and into AC line signal filters operating at 60 Hz to smooth out electrical signals... replaces rigid, non-recyclable plastic substrates used in flexible electronics with tough, breathable, renewable, plant-processed natural material... stable even after repeated bending/ charge-discharge cycles... enables thinner devices/ power external... smart clothing, health-monitoring patches, LEDs, electronic watch... future: sweat/ humidity resistance"