Tiny ‘supraballs’ put a new spin on creating long-lasting color
Composed of a melanin core and silica shell, the particles get their hues from tricks of light
![balls of nanoparticles](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2017/09/091417_LH_supraballs_main.jpg?fit=860%2C460&ssl=1)
TO DYE FOR By changing the spacing between nanoparticles aggregated into balls, researchers created these inks of five different colors.
Ming Xiao/Univ. of Akron