Using magnetic ink and any oil lying around your house, make a substance that's liquid when it's sitting around, but turn solid in the presence of a magnetic field
Step 1: Intro
This instructable will show you how to make your own ferrofluid. A ferrofluid is a fluid with magnetic particles in it, and if the fluid is exposed to a magnetic field, all the magnetic particles will align with the field lines, and making the fluid much more dense. There's a lot of cool things you can do with this fluid. Enjoy!!!