Make your own ferromagnetic
The key material is a mineral
called magnetite which can be bought on the internet. 10
pounds will cost about $15.00, or you can go to the beach (or
a big sandbox) and mine your own. All you need is a magnet and
a plastic baggie. With the magnet in the bag, just run it
through the sand and it will pick up the magnetite.
Brush it off onto a paper
plate. Continue this until you have as much as you think you
need. You will need to repeat the action until the sand is
gone… What’s left is Magnetite.. At this point, it’s a good
idea not to let it directly contact a magnet. It will be very
hard to get off. Put what you need in a paper cup and add
enough ordinary cooking oil to make a thin paste, and stir it
The magnetite needs to be
saturated with oil… All that’s left to do is take out the
stick, and place a magnet next to the cup. It should
“solidify.” When it does drain off ALL the oil.
What you have left is
Ferromagnetic Fluid. Have fun!