Ferrofluid is a liquid that becomes strongly magnetized in the presence of a magnetic field and is typically composed of ferromagnetic (iron) particles suspended in oil. When exposed to a magnet, the particles align with the surrounding magnetic field. The complex orientation of the ferrofluid visualizes the magnetic field around the magnetized screw and nut.
Source: https://youtu.be/kL8R8SfuXp8
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