Wow, this is amazing. The magnet pulls itself into the iron-filled ooze. It looks like a D&D monster.
Originally shared by Francesco Busiello
Rare earth magnet ‘eaten’ by ferromagnetic putty
The silver cube is a neodymium iron boron magnet. The putty has been infused with millions of tiny micron-sized particles of iron.
The rare earth magnet aligns the particles in the putty with each other which create a magnetic field. The putty will remain magnetic for a few hours even after the magnet has been removed.
Source video (with more info): Magnetic Putty Time Lapse 1080p