http://www.youtube.c...h?v=3W7rMRtE708

I don't know the exact chemistry of what I have here, I just know it's some kind of iron oxide [font="Arial"](I'm thinking Fe[sub]3[/sub]O[sub]4[/sub], b[/font]ecause of this description of preparation). The video above is from a more liquid version, I eventually got it boiled down to a thicker sludge than even that and it was much more reactive. I don't have a strong electromagnet available right now (I'll build one tonight), but a neodymium magnet was pulling the surface of the liquid from about 2mm away.

What was especially interesting was the fact that I used a microwave to boil the water off. It got to a point where I could hear arcing while I was microwaving it. When I removed the container, there were small flecks on the surface of the liquid, a lighter color than the liquid itself. They were magnetic, they were solid, and they rolled up and folded a bit like very thin foil when I pinched them. I'm pretty sure it was pure iron.

$100 if you drink it-

-For Science.

Just saw this today on a blog I visit.
[media]http://vimeo.com/28304264[/media]

That's fairly slick.

Nice voiceover but a 1min video of which 50s was you looking at a cup. I was waiting for something exciting then it ended.

Ferrofluids are just fuild ferromagnetic materials, like small iron magnets in suspenion. Do not drink while in microwave, lol;)