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.
Best DIY Slime Recipes - DIY Magnetic Slime Recipe - Cool and Easy Slime Recipe Ideas Without Glue, Without Borax, For Kids, With Liquid Starch, Cornstarch and Laundry Detergent - How to Make Slime at (Cool Crafts Slime)
DIY magnetic silly putty - I am not sure what all goes into it or if it toxic, etc. but the idea of it is REALLY neat. I am going to have to check into that during out magnet unit in science this year!
This GIF Of Magnetic Putty 'Eating' A Piece Of Metal Is Mesmerizing
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.
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.