Step 1: Dry Ferrofluid
Put the iron oxide in a jar or test tube exc.
Step 2: Add Water
add water. fill to about the top
Step 3: Seal and Play
Seal the lid with a sealant i used Blue Rtv. Put a ring around the seal and put on lid. That's all your all done just bring your magnet near the side and watch as the iron oxide turns from a blob to a pokey blob.
Step 4: How to Make Ferrofluid With Oil
This is another way you can make ferrofluid using oil. First put some motor oil in a cup or dish.
Step 5: Add Iron Oxide
Add the iron oxide. If you want it to keep its shape after you move the magnet away make it thicker than i did.
Step 6: Enjoy
You can now play with your ferrofluid freely.
CAUTION it is extremely messy and should be treated accordingly.
This is my first instructable please leave constructive and helpful comments.
I will have pictures of it when a magnet is near soon.