The amazing ferrofluid is a truly magnetic liquid that consists of micron size magnetic particles (magnetite) in a mineral oil
Particles are coated in a surfactant which prevents them clumping together
When a magnet is in close proximity the magnetic particles in the Ferrofluid take up the shape of the magnetic field to create a 3‐D version of the classic iron fillings on a piece of paper experiment
The apparent density of ferrofluid can be changed by applying a magnetic field
e.g., place a one pence piece in a shallow dish (5mm) of ferrofluid and it will sink
Bring a powerful magnet underneath and the coin will float!Supplied in a plastic jar containing 10ml of Ferrofluid
