Magnetic Slime--really neat, but it requires liquid starch, iron oxide powder, and really strong neodymium magnets. There is a commercially available magnet putty that might be a good substitute for exploration.
100 lbs kg) of Magnetic Putty We’ve. 100 lbs kg) of Magnetic Putty We’ve been selling Magnetic Thinking Putty for years and have always been astounded by the burning questions we’ve received for this ever-popular item.
Magnetic Putty Magic by Joey Shanks, PBS Digital Studios: This moldable putty which contains micron-sized bits of iron takes on the properties of a magnet itself when placed in close contact with a strong (ex- rare earth) magnet.