You are viewing a single comment's thread from:RE: How Do Birds Migrate? | Earth's Magnetic Field | High Speed Rail | The Uses of Magnets | FerrofluidsView the full contextinventa (42)in #science • 7 years ago thats great¡¡ , i have a question. do you know to make a ferrofluids?.
Take the black powder out of a laser printer cartridge and mix it with vegetable oil. Its messy.
You will also need a rare earth magnet. Good luck.