Researchers create 3D printed, biodegradable, color-changing conductive material from cellulose

https://phys.org/news/2023-07-3d-biodegradable-color-changing-material-cellulose.html

"hydroxypropyl cellulose mixed with water HPC whose colors change with concentration and temperature...added 0.1 weight percent carbon nanotubes to HPC and water... conductive and control applying voltage... acts as broadband absorber deepening colors deeper... small amount cellulose nanofibers make it 3D printable... changes color in response to mechanical deformation, 7-segment display, temperature and strain sensors, food quality control, biomedical diagnostics, biodegradable electronics, IOT"

Related: Tiny networks intertwine to mimic design of bird colors

https://phys.org/news/2023-10-tiny-networks-intertwine-mimic-bird.html