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Andrew Magill

Ferrofluids are made up of tiny magnetic fragments of iron suspended in oil (often kerosene) with a surfactant to prevent clumping (usually oleic acid). The fluid is relatively easy to make at home yet extremely expensive to buy on-line. How does $165 a liter sound? Pretty bad, right? Click here to learn how to make ferrofluids on the cheap. http://www.popsci.com/diy/article/2009-09/making-ferrofluids-work-you
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