強磁性流体

My 8-year-old was completely mesmerized mixing the powder and liquid to create the ferrofluid, and the way the black liquid forms spiky shapes with a magnet is just incredible. We spent a whole afternoon experimenting with different magnet positions and watching the patterns shift. It's a genuinely

Watching the magnetic spikes form and collapse is mesmerizing — my kid spent a full hour experimenting with different magnet positions. The included iron filings mixed easily with the oil to create a thick, reactive fluid.

Mixing up the iron filings with the oil and bottle was way more fun than I expected for a simple kit. The included magnet is strong enough to get the fluid to form those wild spiky shapes, and it kept my kid busy for over an hour. I just wish the instruction card had a few more experiment ideas.