Ferrofluid
Followed the directions from here.
View some pictures here, <html> <table style=“width:194px;”><tr><td align=“center” style=“height:194px;background:url(http://picasaweb.google.com/f/img/transparent_album_background.gif) no-repeat left”><a href=“http://picasaweb.google.ca/photonicsguy/Ferrofluid#”><img src=“http://lh6.ggpht.com/_o8vuO8ku2Bo/R3CmoXghZGE/AAAAAAAADVI/zftZMUTQdNU/s160-c/Ferrofluid.jpg” width=“160” height=“160” style=“margin:1px 0 0 4px;”></a></td></tr><tr><td style=“text-align:center;font-family:arial,sans-serif;font-size:11px”><a href=“http://picasaweb.google.ca/photonicsguy/Ferrofluid#” style=“color:#4D4D4D;font-weight:bold;text-decoration:none;”>Ferrofluid</a></td></tr></table> </html>
