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FERROUS FLUID

In search of novel materials for use in advanced aircraft, alchemists have stumbled upon this little curiosity: a black oil that responds unprecedentedly strongly to magnetism, compared to other known liquids. For now, many treat it as a scientific toy of sorts, but applications for it have just begun to be discovered.

Of course, the people who came up with it had far greater budget than you do right now. Just lead and tin, huh?