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This fascinating product is a black oily liquid which responds to magnetic fields. When placed near a magnet it leaps onto it, arranging itself into spikes as seen in the picture. It does look like it sets hard but If you touch the spikes you can feel that they are actually still liquid.
Our ferrofluid is used in many applications. For example; automotive dampers, car speakers and for special effects in films, general hobby or general scientific use.