Iron filings in the water
Clean iron filingsFinally, I put the iron filings into water to clean them. It is easy to separate the iron filings from dirt: Just shake the glass and place a magnet to the bottom side. The dirt stays in the water and can easily be removed. The iron filings stay on the glass bottom. I recommend at least 10 repetitions.
Showtime!Now we need a bottle that should be transparent, tall and narrow.
Using oil is very similar to our product ferrofluid. We published several applications on that.