EFH1 Ferrofluid 20ml for Science, Education, Experiments, Students, and Teachers

The fluid comes with two small screwtop plastic containers, along with a standard plastic petri dish and pipette. For the best effect I would advise putting a small amount in the petri dish, barely enough to cover the surface, and approach with a magnet from below. Be very careful, as a strong magnet from the side can easily cause the fluid to fly over the edge out of the petri dish!Be extra careful, since the fluid stains most materials, and can be difficult to wash out.The effect from a magnet is very interesting to look at. The volumes required are very small so this amount could be used to amuse quite a few people.

We don't use the petri dish included, as it was cracked, but the ferrofluid is exactly that. The little amount you get is plenty to get some beautiful effects.Do look at the warnings included, especially the keep it off your magnets point, I put a drop on one to see what it would be like; it's not really bad, just you will never get it all off. This stuff really can stain.

Bought it as a part of some research in to materials. Definitely worth the money spent for something that is so responsive. Its a little bit messy, I managed to get a tiny bit on my hands even though the liquid was in a closed jar (no clue how). Bought a £5 Neodymium magnet along with it and it definitely did the job. 20ml is actually a lot. 10ml would easily be enough to play around with. Ridiculous value for money!Arrived well packaged and in good time. Make sure to read instructions before using.

In first years it was great (5 stars). After 2 years not used and 2 years in a closed container for student demonstration it became solid and it is not responding to magnets (1 star). I contacted FIRST4MAGNETS and will let you know.

Great fun, just make sure you buy a neodymium magnet (a small one ~ 2cmx1cm will do) as this gets the best results due to the stronger magnetic field. Can play with making shapes in the petri dish or put the ferrofluid in water (videos online) and see what happens then. Loads of opportunities to have fun with physics, just make sure to keep it in the containers as it stains everything.

Does not really seem like a fluid more like very small filings. Dissolves into brown mess in bottle.

Interesting to see different patterns using different shaped magnets

Quite disappointed with this, it's very weak and does not have viscosity, I tried with different magnets but the fluid is so bad it just messed the jar and everything makes the container black, no fun at all. I was hoping to make art project with it, like sculpture and this is no good, you cant drag it or pour it, it's just mess.