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"Ferrofluids are composed of nanoscale ferromagnetic particles suspended in a carrier fluid, usually an organic solvent or water. The ferromagnetic nano-particles are coated with a surfactant to prevent their agglomeration [..]"

German article "Fun with Magnets"
the movie to the pictures on the right

website of a German "Jugend forscht 2007" (youth doings research) project
safety precautions (German)
a guide on how to produce this stuff yourself.. not so detailed .. but pictures :)

good tutorial in German, no pics but a detailed list of components

english instructions with a little different procedure, looks interesting:

another howto make your own site in english:

A German distributor