Author: Jia Camacho
Ferrofluid, or ferromagnetic fluid, is a type of fluid that becomes magnetic in the presence of a magnetic field. The shape of the spikes that the ferrofluid makes is because the magnetic fluid takes the most stable shape. This way, it can minimize the energy in its system. This effect is the normal field instability. Ferrofluid is easily magnetized more than the surrounding air is. This results in peaks and spikes being created. This magnetic fluid is made out of 5% magnetic particles, 85% carrier fluid and 10% surfactant.
You can make your own ferromagnetic fluid at home as well. Buy a 19 ink developer and add some vegetable oil. Use a lower viscosity oil like kerosene or biodiesel. Use surfactant which is made out of citric acid, oleic acid, etc. Surfactants might further improve the quality of your ferromagnetic fluid.