This ferrofluid bolt kit starts simple, but the payoff is instant. The moment the magnetic fluid touches the bolt and neodymium magnets, it erupts into sharp black spikes that look almost alive. Then ...
Inside the kit: a 50 ml bottle of ferrofluid, a specially made ferrous nut and bolt, and heavy magnets. The result: mesmerizing spike patterns as magnetic field lines become visible. Just beware - the ...
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