Mixing a ferrofluid with the contents of a glow stick can produce some beautiful glow-in-the-dark shapes. A 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. The complex orientation of the ferrofluid visualizes the magnetic field around a nearby magnet.
Source: https://youtu.be/RtBtD0_KZ9o (Physics Girl)
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